You need more art materials.
I'm not much of an artist. I drew a fox once, drew boobs a few times, and that's all I've needed so far. The issue is that I can't use any external art because the only reason I can make the boobs wobble is because they're vector paths rather than just bitmap pixels.
If you check out my FurAffinity gallery (RoanneTheWolf, you have to have adult mode enabled) you can see the progression from badly-drawn-foxes to badly-drawn-but-bustier-foxes.