How do I write a good prompt?

Be specific about style, materials, light and atmosphere. For example, “Modern minimalist living room with a gray linen sofa, oak coffee table, warm late-afternoon natural light, white textured walls and decorative plants” works much better than “modern living room”.

Describe the result, not the process, and respect the perspective and structure of your base image. If the model is NanoBanana Turbo, spell out everything you expect to see.