I can imagine Krita would look a bit daunting to someone just going into that kind of thing. Having come from Photoshop and GIMP, it looked so much more managable to me XD
I didn't think original assface looked that flat. Shaded assface definitely had more depth.
Not completely flat, no. I usually do take the time to add at least some depth. I could go a lot further with the shading here and create the illusion of three dimensions. But he's just cartoon, back from vacation.