Seriously though, not to totally discredit you here, Bovey, but I think you need more than repitition to do well at something. It's like playing any sport, musical instrument, or learning anything in the world for that matter. If you keep doing things the wrong way, you get bogged down with more and more bad habits. I constantly jump back to the basics. Without them, you have nothing. try to accomplish a weekly or monthly goal. i.e. I'm going to learn how to draw the face. Done. Next week, I'm going to learn to draw the neck attached to the face. so on and so on. But learn from anatomy books or someone who knows and has been through the same pangs as you have. And learn from everywhere.....life drawing, other artist who draw more than just comics, magazines, your girlfriend, your dog, anything and everything is game. Watch movies and draw quickly what you see while the movie still plays. Video helps you understand movement and figure out why and how a right hand can reach over and touch a left ear with ease and what the body looks like as it does. There's an unbelievably nice Canadian art professor named Pete Emslie who "conned" me into drawing from video a while back and boy did it pay off. If you have TiVo, or an equivolent, you can replay a motion over and over and get multitudes of information from it. You can see muscles flexing over bone. Tendons straining from weight being lifted. etc. etc.
Hope this helps some, as I am still learning too! PJ has been a remarkable place to do so, so take advantage of it's incredible body of intelligent and talented artist!!