The person I happen to have drawn is skinny and tall (although I do tend toward skinniness and tallness in my drawings).
So your person is an anorexic giant?
But seriously, add a bit more thickness.
Neck is too long and triangular shaped.
Hands need work.
Other facial features like noses and mouths need work as well.
I'm not trying to be a richard, you said your proportions aren't perfect. Don't make excuses, just fix them.