look at me

Wow - amazing.
Good points - it gives the impression of a photo from a distance. And it actually looks like them. In fact, I believe that Bella looks even prettier than Kristen Stewart, even though it's obviously her. I think you might have angled the jaw more so her mouth sticks out a bit more and removed some puppy fat from the cheeks. It's very subtle, whatever it is. And you've even got some kind of eye defect on Bella's right eye on the white of it. Very realistic. Expressions are very much in character.

Points for improvement - it looks painted. The hair is great, but the skin has patches on it - it's not a smooth gradient, especially around the cheeks. Maybe you wanted that effect, though. Edward's right eye looks kind of flat in the iris - I believe that the upper part of the iris should be darker. Because he is looking down slightly, the light from above wouldn't necessarily illumine the entire iris. Bella's was perfect. And Edwards chin looks a bit fat, for some reason. But maybe he's like that.

Anyway~
x3

This is my own opinion, and please feel free to take notice only if you also feel it is correct. :3