So you got a great vision of what you want to do but you can't realise it with texture brushes? No problem!
Shadowforge can help you with that. Draw in pixels with the Draw Tiled feature. It's easy to form something out of pixels, and Shadowforge lets you tile them together however big the pixels are. 64x64? Sure! Maybe you can make a face out of it. Well, I did that.
I made a panda face from pixels with bamboo trees in the background and a wooden house that can not be seen because the focus is on the pandas face.
Here is the pixelized version (took me only 5 mins or so):

Then I cartoonized it by not blocking the colors and actually making it cel shaded with simple circle brushes. I wanted the panda to crave for something, and he is making that face when he thinks someone doesn't understand his needs.

FInally, I used the leaf brush and the alpha brush together to give him some textures to make it look less cartoony but, but still somewhat cartoony.
It should be apparent that the panda has fur, and is not a gummy bear.
Here is the final result of about 15 mins of drawing:
