The next prompt is Nature
Make an animal!
Make a plant!
Make a fungus!
Make your own topic and post one (or several!) submissions.
A really good image needs some really good reference material. Check out Inaturalist.org/observations for a searchable database of almost any plant, animal, or fungus. For common species, you can find thousands of amazing images, all community verified. Here is a tiny sampling of images for Sciurus carolinensis - the Eastern grey squirrel
spending a little time on that database will give you a great selection of reference images.
Here is a vintage example from @DichotomyMatt - a beautiful butterfly