I voted art. I'd like to see the process sketches too, but not a lot of them as the final piece is always the most important. The explanations of the desings are an important part of it too, they're what transport us into the creatures universe and help get what you intend us to think way better.
Well im personally a sketch artist. So it would be pretty cool to see the process of what you draw. And Iam also a fan of photoshop so maybe some cool tutorials on skin or eye balls! I've been tryin to perfect color in the eyes for a long time.