"1.) Architecture. I'm pretty good at trees and hills and you know, natural landscapes, but as soon as I have to draw man-made architecture, my brain just kinda goes "noooooooo D:" and it goes all stiff and weird looking.
2.) Angles from below. Drawing a person from below, so that you can see the underside of their chin, is freakishly hard. People who can do this with no trouble are like magical art-wizards to me."
Both of these things. I scrapped my plans for my second graphic novel because it would've involved too much man-made structure drawing. I opted to turn it into a radio play instead.