Something is wrong with the neck. This was a life drawing from my figure class at school. My professor only gave me this vague "it needs more development in the neck" comment. I can see that the neck has issues, but I am not sure what I can do to help them. http://figure-of-speech.deviantart.com/art/richard-476917058
I hate it when people who are supposed to teach us end up doing quite the opposite!
Did you use a reference image for this? If you did it would be helpful to compare. In the meantime I'll do my best to pinpoint what's a little off, though I can't make any promises that I'm 100% right. Edit again: Herp derp, sorry! I read that this was a life drawing study so obviously there was no image, but my decaffeinated brain didn't register this.
The neck seems unusually long. It stood out to me immediately, but it may not necessarily be too long. This might be because your drawing is missing a proper connection between neck and shoulders. It's like the collarbones are missing. This gives the illusion of the neck being too long, plus it makes it look like it's not connected to the shoulders.
I tried to draw over it roughly to show you what I mean, I won't use this anywhere else other than this topic to help you. Does this look like it makes sense to you? I did this very quickly, sorry for the messiness.
Thank you so much for the critique. I see what you mean about the neck. At this point, I don't know if it is possible to erase all of that and redraw it without messing up the picture because I no longer have access to the model. I just wanted to know what it needed so that I can learn for my next drawing.