NanoBanana очень умная. Испробовал вчера такой промпт. В полный рост пикчу не обязательно, нейронка дорисует. Советую:

Create a portrait depicting the person as an artist painting a miniature figure. The person is dressed in their most iconic outfit, looking confidently directly at the camera, holding a small paintbrush in one hand. A mini version of themselves is prominently placed on a clean workbench in front of them—make the figure slightly larger to be more visible than actual scale, thus standing out more. The figure is also wearing the same iconic outfit and striking an iconic pose. The painting supplies on the workbench are minimal to avoid clutter—only two or three small bottles of paint and a spare brush, keeping the focus on the person and the figure. Soft neutral white background, professional studio lighting, shallow depth of field. The composition highlights the person's facial expression looking at the camera and the figure they are painting. The style is clean and crisp, pursuing photorealistic effects, and details of both the person and the figure need to be highly restored.