08-15-2012, 12:43 PM
You need more motivation!
I had similar problems myself. Can't concentrate, hardly can finish any of my works and drawing nude girls all the time...
For me it was wishing for the result and not enjoying the process itself! Just relax, don't look on anyone else (ok, just don't harshly compare with yourself, you have your own pass to walk) and enjoy the process itself!
If you're worrying about painting only one kind of things - just ask for commissions, people around will help you!
I solved my problem pretty roughly - I started a job where all I must do is painting environment, landscapes and backgrounds which was a weak spot for me.
Cheers, don't give up on yourself!