Well, you've definitely got the ideas down, and the facial expressions are pretty good too. However, despite the obviously cartoony style, a bit of anatomy would benefit you. A humans legs, for instance, compose almost half the standing persons height. Also, idle arms generally hang pretty close to the body; you don't need pixels of empty space between them and the torso (not at that scale, anyways). In order to show this without it being a super wide torso, you're going to need some sort of shading or outline. Also, the shoulders should be 3 heads wide and the height should be 7-8 heads tall.
Mr Blankface the Manly Man demonstrates. Now, i'm pretty bad at human anatomy myself, so you should probably study it a bit yourself. Just a bit. It's not necessary to know the exact location of every single muscle and bone, but having a general idea helps tremendously. Once you got that down, it becomes way easier to make cartoony things (which i personally enjoy more than hyper realistic things)! And when i say general idea, i mean like:
Really fucking general. That's basically the extent of my knowledge over the human skeleton, not counting a few mahscles. (geology =/= biology)
Also, shading. It doesn't have to be super advanced, you can just be like "RIGHT SIDE IS DARK" and then work your way from there.
It's pretty easy once you get the hang of it. For more info on shading, look here:
http://www.natomic.com/hosted/marks/mpat/shading.htmlDo note though, at the scale i've shown, facial expressions are super hard to do. To include them more easily, you're better off either doing what you do already (making heads bigger) or just drawing the whole thing bigger.
Right now i'm just hoping i don't sound like a huge ass, because i don't like being critical.
In other news, i fiddled a bit more with the SHINY VEPONZ.
In particular, the spear is now in full length (almost 2 meters), and there's a new EVUL DAGGER by a different artificer. One cut from its accursed blade and you have a heavily necrotic wound (i.e. rotting and gangrene) to deal with, which is really bad news in a medieval setting (unless you have a super good healer nearby).