I like that your poses all have a degree of flexibility to them -- personally, I'm haunted by static-looking poses whenever I pick up a pencil. xD I don't think I'm qualified to comment on the bodily anatomy, since I only have a pretty basic grasp of that, but the facial anatomy's a bit strange to me.
You have situations where the eyes are too far apart, the mouth is too low on the jaw, and the nose and lips blend into one big lump. xD I understand that some animes and whatnot will do that sort of thing, but it looks odd to me. Taking that extra minute or so to draw out guidelines will make it seem that much more polished. If you don't understand what I mean, let me know and I'll provide a visual aid. :V
I can tell your bottom picture involved a whole lot of effort. The red lines coming out of that magic circle thingy really serve to make the whole thing more dynamic. The scribbles coming from his hands, however, seem a little bit too busy, and make his pose seem a bit... unbalanced, somehow. The circle itself... I dunno how they're supposed to work, but I feel like it should be bending to conform to the rocky cliff he's on, instead of being perfectly level. It just confuses the perspective for me a little, that's all.
The rest of the picture, however, seems a bit half-assed when compared to the sleek look that Reynald's sporting. All the flying enemies are just copy/pasted and you can tell, and the sea of enemies(?) on the ground looks like a purple cake with a slice cut out of it. The individual red-eyed lumps don't change in size as we recede to the horizon, implying that they're a few miles tall in the back of the army. xD I'm not saying you have to go out and individually draw 7500 purple dudes, but a bit more definition would go a long way in making the baddies match the effort put into Reynald's appearance.
(You might also want to consider color theory a little. The ones you have may be a bit too vivid and juvenile-seeming for the seriousness you intended for this picture.)
Whew... I got a bit carried away, didn't I? XD Don't get me wrong, I'm not saying you're a terrible artist or attacking your work or anything. If you've put a year into the story for your comic, though, that gives me the impression you're serious about this project. I just want to give some constructive criticism in hopes that it helps you along. :]