Wow....that's a...thoroughly remarkable difference. Few things to point out, though.
1) Wings. This is a big one. They look very awkward and...fake, as is.
This is a good tutorial.
2) Tail. Yah. Thicker at the base, I think, and a bigger...uh..twiddly at the tip. Then again, that's mostly a matter of personal opinion.
3) Basic anatomy. Yeah, silly little things like her arms are too thin, she's waay too skinny...etc., etc.
4) Hair. As is, it's just sort of...random yellow. It needs more lines, so it actually looks like hair. (something about her beak seems off to me too, but I can't think of any tips soI'll leave it alone.)