I'd like some more opinions on the foreshortening. I've looked in the mirror and it's hardly a comparison to anime girl arm. Is it really that bad?

My opinion would be the wrist cuff's frill makes it seem like the forearm and elbow are missing. The palm should be wider than the upper arm. That would boil down to bad perspective; flagging seems excessive.

What sticks out to me is that line near the shoulder, which appears to be the elbow... right next to the shoulder.

Also, that hand/fingers look rather thin, don't they? If the arm is pointing nearly directly at the "camera", then they should be much larger. (But then again, her other hand is tiny...)