The sketchy look is kinda cool, but on the other hand, the lack of aa and some unclean lines make it look a bit too unfinished. Sketchy can be polished/finished too. :)
Like the colours, but it could really use some more working on.
Wish you'd polished this a bit further. It's still nice though. 
Seems unfinished to me, but with these colours the pic has a potential.
Not sure antialiasing ultra-saturated purple with de-saturated orange on the white background is a good idea.
the right side of the face confuses me a bit as it looks as if you meant to fill it with orange but didn't like the look and just slapped the pink hair over it, I like the piece as a whole but there are just some areas that seem to flow a lot more organically than others and a few minor shading inconsitencies. nice work though.