Reddit mentions of Netter's Anatomy Coloring Book: with Student Consult Access (Netter Basic Science)

I know how exciting it all is, but really you should use this opportunity to do anything that has nothing to do with medicine! It will be your last chance for a very long time. Before the end of the year you will become extremely sick of it all - you don't want that to happen a minute sooner than it should!

Edit: just a heads up: that anatomy colouring book sucks balls compared to Netter's. http://www.amazon.com/Netters-Anatomy-Coloring-Book-Student/dp/1416047026

Gotcha! Some resources that might be helpful:

Loomis has some good (free) books on constructive figure drawing, which is what you want to learn if you're interested in drawing characters out of your head. I'd recommend Figure Drawing for What It's Worth in particular.

Ctrl+paint is another great resource for learning the art fundamentals that are specifically relevant to illustration. He also has a lot of great information on how to get into Photoshop.

If you want to be drawing characters, it would probably be good to thoroughly learn anatomy. I've seen scattered tutorials for this, but I've had better luck with books- Burne Hogarth and Bridgeman are good, and I've also found Netter's anatomy useful for learning the names of bones and muscles.

For color theory, I would recommend Gurney's Color and Light.

Also check out the sidebar, there's a ton of educational material under "useful links."

I would recommend starting with ctrl+paint or Loomis, and working from there. Both sources will give you an overview of a lot of topics that you can go on to explore in more depth. And of course, keep up the practice.

Best of luck!

http://www.amazon.com/Netters-Anatomy-Coloring-Book-Student/dp/1416047026/ref=pd_sim_b_2
They won't absorb everything, but coloring helps people learn.