Seeking Constructive Criticism: Demon Archer

Using this as a model, I've drawn a basic sketch of a demon archer as a birthday gift for a friend. I'll detail it later once I have the basic frame and dimensions correct. But for now, a lot troubles me about this design. Her left arm (from her perspective) is a mess. And I don't think her head matches her body. And I don't want to give her fan-service breasts, but I also want their structure to make sense based on the necessary muscle strain and stretch of the arms, so I had to oversize them in order to help with alignment.

I wanted to extend her jaw more like this image but she kind of looks like she has a massive under bite.

Anyway, without further ado... here's the picture. Any advice on how to fix?