How to replicate the watercolor style of GPT-4o?

I ask for help in replicating the style of images produced by GPT-4o (on the right) with Z-Image Turbo or StableDiffusion (on the left) or something else (ideally, something I can self-host); for use in a picture book. The prompt for GPT-4o is " Planet Earth seen from space. Watercolor sketch on a pure white background ". I tried replicating the visual style with Google Gemini, as well as with the Krita AI diffusion plugin with either Z-Image Turbo or StableDiffusion XL. However, I can't get it right.