I like proportions. They seem to be correct :D Also i like your choice of pose. But what i don't like and what you can improve (in my opinion ofcourse) is:
- smooth and fast lines. I'm not sure, but it looks like you drew it with mouse. Anyway, your lines are not confident and make feeling of beeing broken. When you draw lines, try to make it fast and smoth or do lots of short lines connected to each other (but be sure to use small brush to hide imperfect connects).
- feet. Lots of artists ignoring practicing of drawing feet. As result they look weird and unusual.
- shadows and light. All of them are drawn sloppy - hole picture looks very dirty then. Try to spend more time correcting it to look crear. It will take you on another lvl automatically.
- background is drawn too simple and (again) dirty. Also you chose bad type of brush for blood on the floor. It wants harder brush, not that soft. Soft brush is better for some gases or smooth shadows what is not this case.
I hope it will help you. Good luck!