Looks like you know what you are doing - based on the ghost outlines around body parts. I expect with practice you'd probably be able to produce quality, but at the moment (as it's just a sketch) it's a little rough and untidy. Shows promise though :-)
It doesn't look bad, it just needs work. You should practice, practice and then practice some more. If you want some tips, send me a message. :p I'll try to help you to the best of my ability.