Awesome, some real tips!
Alright: Well, as far as the first drawing, it's digitally cropped, I didn't try to force his arm in there, I had a lot of page space. If it looks off, I've been spending a lot of time experimenting with "action" poses, as my drawings were usually just standing there (ala Xena there), and I haven't quite warmed up to it.
As far as drafting and my lines, I'm a really clean worker. I start with skeletons and such and work my way up to shapes and back down to detail, and I erase a lot, but I make sure the sketch lines are gone. Unlike most artists I follow, I try to finish my drawings with a pencil, since I couldn't ever find an ink pen that I actually liked using.
Anatomy is something I've been trying to wrap my head around for quite a while. My drawing style has been evolving since I started at a very young age. Originally I attempted anime-esque eastern art, then moved on to trying photorealism, and then I ended up at this kind of cartoon-phase inspired by Mike Krahulik's earlier stuff.
I have a really hard time recognizing flaws in my art because I literally draw them with my face pressed against the page. I can't really look at it from a far enough distance to see what's wrong. Looking at them now, they're wonky as fuck.
And you want to see something original, eh? Give me 20 minutes.