On the back of my 3D Rubik’s cube I did with markers, I decided to try it with an airbrush.
This is just a random skull I got off Google. I like it because of the angle and it is grounded with the shadow it is casting.
I started in Photoshop adding perspective to the source and then just transferred it the same way I do all my paintings. When I was done I trimmed the paper so that it looks like the skull is sitting on top of the paper.