For those of you that are unfamiliar with David Colman, here is his blog:
In case you couldn't tell, he's really f'n good! He's also a great teacher and he's holding an animal drawing workshop on January 30th and 31st. It's $200, $175 if you're one of the first five people to register.
Anyway, I've taken his class twice and his animal workshop once and I say it's totally worth it. Not only is it good practice, but one-on-one time with David is priceless. He'll point out exactly what's wrong with your work and show you the best way to fix it.
The improvement in my art since leaving LMU is 80% because of Colman (20% Kevin Chen, who is also awesome). So in case I was too subtle, you should sign in to David's workshop! If you're interested, shoot him an email at firstname.lastname@example.org