Wow that's quite a lot of stuff you drew there! I would not buy it because for me the quality is not high enough. Don't forget the hand drawn style in games has a very personal feeling to it, and I think many developers using the hand-drawn style usually wish to express themselves by them self. Anyway you earned yourself some respect! I'm sure this alone leveled up your art skills and if you re-did it now it would look 2x as good. Maybe try ink?