Ah, I see my mistake! You were right, mysterymeat. I was referencing myself in the mirror, and I'm much shorter than the tall model in the picture. I also didn't recognize or account for her hunched-up shoulders, which made my use of the hand-thigh rule incorrect. Woops!

I'm still not convinced that the anatomy is 100% -- specifically, the knees on that skeleton don't align with the knees on the photo reference, which suggests that other stuff is off, especially in the arm-n-shoulder area -- but since you're modifying the pose, perfecting this one is irrelevant.
Good work so far, and good luck moving forward!
Edit: ninja'd - that pose change suggestion looks really good! thumbs up to the shape of the arms, especially.