Interesting indeed, and Manupix pretty much said everything. I'd just like to add that it looks a lot like me!
Interesting!
There's generally too much of it. AA is uniformly applied as a 1px outline, but there is no (or almost no) need of it for 0 - 90° lines, and for most 45° lines as well. There is banding too (chin, top of head, mouth). Dithering is probably unnecessary, but ok as experiment. There's a little too much of it too, it looks wrong in the hair (top and right), and jawline.
really jao?!?! how old r u?