I'm self taught, and maybe with your critique I might be able to get some more direction.
My preferred tool is a pen, but sometimes I also dabble with pencils (big difference, I know), watercolors, and my girlfriend just bought me a nifty set of alcohol based markers which I wanna be able to use properly.
I'm far too busy to post daily since I work as a Software Consultant, but it's far better than nothing.
Some of the things I do I use references from anatomy books, others I draw from imagination, you can easily recognize which is which.
Without further ado, my scribbles: