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I'm workin on that. I think I have a habit of tilting the sketch pad when I'm drawing. I'm gonna try to make some light guidelines when I start a new drawing from now on. But what about the actual drawing?
It's hard to judge the actual drawing as you put it without noticing the tilt/unevenness.
I think your art is improving, but apart from what was already aforementioned, you should also try working on balance. Almost all of your characters/monsters, to varying degree, look like they could fall over in an instant. Particularly when trying to convey a sense of power, you need to make sure they are properly grounded.
http://cedarseed.deviantart.com/art/Big-Guide-to-Drawing-the-Body-15014442
<< This is a useful tutorial to look into, but particularly pay attention to the blurb on the bottom about Balance.