Rather than making your characters stand in one place, (to quote comic editor David Campiti) standing around, doing nothing like an idiot (no offense), what I suggest is that you get a picture of someone in a position, then copy that pose.

You can pick up a reference pic almost anywhere, from a magazine to the internet. This famous artist named Mike Deodato has a library of pictures of people in random pictures. Take it from me, there's no shame is copying poses.

Just practice more. Try to refine your skill in anatomy slightly further. Practice drawing faces. Besides that, you're on the right track. Keep on drawing!

--
I spit in the face.. of n00bs who don't want to be cool.

I like having low self-esteem. It makes me feel special - Jane Lane