Stuff I learned - Ren is actually reeaaally hard to get right. Probably an effect of trying to translate from a pretty extreme art style to my relatively anatomically correct one. Some big problems I had - (1) Ren's hair has to be just so, not too long, not too short, angled in the perfectly right places, or it no longer looks like Ren. (2) Ren's face has to be just so. If it's too long it's no longer in my style, if it's too short it no longer looks like Ren. (3) Ren's eyes have to be just so, since the eyes are so detailed in the original style, and the slightest change denotes a completely different character that he's playing. I had a pretty hard time not accidentally drawing Katsuki.
Watch me on DA! http://kchuang.deviantart.com/