To be honest Jeica- sometimes to improve your art you need to look at what really bugs you and adress that insteed of what you think it is. See, I think your proportions look right to me. I seriously don't think its your issue. If you want critique on what does look wrong, then I think your next step is dynamics- not proportion. It may look out to you cause it may look mundane. You seem to draw a similar pose looking forward. Don't be too exciting on your first few, but try doing an action shot of someone running. Or doing a pose you've never tried before. Spend as long on it as you need. I think that is your answer- you have the basics. It's not biggie- you're alot further with art than alot of people are. IF you're at this point with art and STILL want to get better, then I know you have the drive to get action shots ^^ If I can do it, then so can you ;)