Well, I wouldn't exactly call myself an expert, but I'll see what I can come up with. Also, this is the first time I've given concrit outside of a lims and there have been plenty of votes where I was more than just worried about what I said...
#1: The colouring seems a bit pale (or is his skin normally this reddish-pale? I don't know much about anime so that might just be the case...) A bit more contrast might be useful as well... but these might just be personal preferences. However, the main point: The name (?) is very hard to read with the white font on such a pale background.
#4: I'm in a twist about the crop... a part of me is screaming it's perfect (the way you immediately focus on the eyes and the lips with the finger) and another is ready to complain about how close it is (because of the missing chin)... I'm caught somewhere in between. I do like the colouring though. I think it fits the expression.
#5: The skin seems a bit too yellow... it's not necessarily the colour but how much colour there is (reducing saturation?)
#6: I don't know what the thing on the right side (over her should) is, but I do find it a bit distracting.
If you have any questions... feel free to ask. And once again, I wouldn't call myself an expert (rather somewhere between novice and proficient) so take my comments with a grain of salt.