I don't know if you still need it, but maybe you can do a simple backround so that things look far or close, Idk like a forest or something, or you can do some sort of animal face maybe. Or you can do one of those things where it's the same image repeated so it goes from smallest to largest. Idk, maybe stuff like that.
Or if it's that type of drawing where everything is really colorful maybe you can choose 3-4 colors to make an image with a specific feeling to it. Like choosing certain colors to convey a feeling, yk, when red can mean anger or love, yellow is happiness or alertness and so on. Or you can just draw anything you like with many pretty colors, that works too, but you'll have to balance the colors a bit.