Nano Banana Prompting for Ad Creative: How to Generate Campaign-Ready Visuals with Google's AI

Google's Nano Banana 2 (the Gemini 3.1 Flash Image model) is the most capable AI image generator available for advertising right now. It's the default image engine across all Gemini apps, it's integrated directly into Google Ads, and it attracted over 13 million new users in its first week of release.

But there's a catch that most marketers discover quickly: the quality of your output is entirely determined by the quality of your prompt. Vague inputs produce generic images. Specific, structured prompts produce assets you can drop straight into Meta Ads Manager.

At VXTX, we've developed a prompting framework for Nano Banana that consistently generates campaign-ready visuals for clients like STYRKR, FLOWBIO and OGT. Here's the exact approach.

What Makes Nano Banana 2 Different

Nano Banana 2 isn't just another image generator. It has several capabilities that make it specifically valuable for advertising:

• Subject consistency. Maintain character resemblance of up to five characters and fidelity of up to 14 objects in a single workflow. This means you can generate a series of ad images featuring the same model, product or setting—critical for cohesive campaign creative.
• Precise instruction following. Enhanced adherence to complex, multi-part prompts. You can specify composition, lighting, colour palette, text placement and mood in a single prompt and Nano Banana will follow all of them.
• Native text rendering. Nano Banana can generate text within images—headlines, price points, CTAs—in eight languages. It can also translate and localise text within an existing image.
• Production-ready specs. Full control of aspect ratios and resolutions from 512px to 4K. Output directly in the dimensions needed for Meta Feed (1:1), Stories (9:16) or landscape (16:9) placements.

The VXTX Prompting Framework

Effective Nano Banana prompts for ad creative follow a consistent structure. We call it the SCALD framework: Subject, Context, Aesthetics, Layout, Directive.

S — Subject

Define exactly what appears in the image. Be specific about the product, person or object. Include physical attributes, colours, materials and positioning.

Weak: "A protein bar on a table"

Strong: "A chocolate-coated protein bar with visible oat pieces, standing upright on a matte black surface, wrapper partially peeled back to show the bar's texture"

C — Context

Define the environment, setting and situation. This gives the AI information about background, surroundings and narrative context.

Weak: "In a gym"

Strong: "On a chalk-dusted weightlifting platform in a dimly lit CrossFit box, with blurred barbells and kettlebells in the background, early morning light streaming through industrial windows"

A — Aesthetics

Define the visual style: lighting, colour palette, mood, photographic style. This is where you control whether the output looks like a premium product shot, a lifestyle photo or a UGC-style frame.

Weak: "Professional looking"

Strong: "Soft directional lighting from the left, warm colour temperature (3500K), shallow depth of field with f/1.8 bokeh, muted earth tones with a single pop of brand orange (#FF6B35), shot on a Sony A7III with a 50mm lens"

L — Layout

Define composition, aspect ratio, safe zones for text overlays and product placement within the frame. This is essential for ad creative where you need space for headlines or CTAs.

Weak: "Leave room for text"

Strong: "1:1 aspect ratio, rule of thirds composition with the product positioned in the right third, clean negative space in the upper left quadrant for headline text overlay, no elements within the top 20% of the frame"

D — Directive

Define what the image should do—its purpose, the emotion it should evoke, and what it should communicate at a glance.

Weak: "Make it look good"

Strong: "This image should communicate premium quality and post-workout reward. The viewer should feel that this is a high-performance nutrition product, not a generic snack bar. The overall impression should be aspirational but accessible"

Prompt Templates for Common Ad Formats

Product Hero Shot

[Product description with specific details] centred on [surface/background], [lighting style], [colour palette], [aspect ratio], clean negative space in [position] for text overlay. Photorealistic product photography style, [camera/lens reference]. The image should communicate [brand attribute] and [desired viewer response].

Lifestyle Scene

[Person description — age, appearance, expression, action] using/wearing/holding [product] in [specific environment with details]. [Lighting and time of day]. [Photographic style]. [Aspect ratio] with [composition notes]. The scene should feel [mood/emotion] and appeal to [target audience descriptor].

Before/After or Comparison

Split composition [aspect ratio]: left side shows [before state with specific details], right side shows [after state with specific details]. Clear visual contrast between the two halves. [Lighting consistent across both]. Thin [colour] dividing line at centre. Space at top for headline text.

Social Proof / Testimonial Background

Minimalist [colour] gradient background, subtle [texture] pattern. [Aspect ratio]. Large clean area in centre for overlaid text quote. Small [product/logo] placement in bottom right corner at 15% frame size. Sophisticated, editorial feel. [Brand colour] accent elements at margins.

Advanced Techniques

Batch consistency. To generate a series of images with consistent style, include a style anchor in every prompt: "Consistent with previous: [describe the established visual style, lighting and colour palette from your first image]." Nano Banana 2's subject consistency across up to 14 objects makes this practical.

Localisation. Nano Banana can translate text within images. Generate your ad in English, then prompt: "Recreate this image with all text translated to [language]. Maintain identical layout, typography style and visual elements." This enables multi-market campaigns from a single creative concept.

Negative prompting. Specify what you don't want: "No text, no watermarks, no artificial lens flare, no oversaturated colours, no stock photo aesthetic." This eliminates common AI image artefacts that make generated images look obviously synthetic.

Putting It Into Practice

At VXTX, we combine Nano Banana for static assets with Higgsfield AI for video, Claude Cowork for copy and Meta Advantage+ Creative for in-platform optimisation. The full stack lets us take a client from brief to live campaign in under 4 hours with 30–50+ creative variants.

For clients like STYRKR, FLOWBIO and OGT, this approach has delivered measurable conversion uplift while cutting time to market from 1–2 weeks to same-day delivery. The prompting framework above is the foundation—it's what turns Nano Banana from a novelty into a production tool.

👉 Book a call with VXTX — we'll show you how to integrate Nano Banana and AI creative tools into your paid social workflow for maximum performance.