Just so you know, from looking at this, I immediately thought this was great, and it took me a while to really think of anything else to say.
I think that the landscape is fantastic, if a bit bright. But who says battles have to be in a grungy-type-setting? So that’s out the window. But the contrast from the explosions make it a bit too bright in my opinion. It looks like something of a wall or a structure in the way background, but the glare from the explosion is too vivid to make much detail of it. It's also a little hard to look at. I’m not sure if it would look like that in reality though, so I may be completely invalid here. But that's the only qualms I had when looking at it.
That’s all I can really think of. Everything else is perfect (I love the little guy way up in the air, and the machine missiles being shot at the one in the foreground; its a nice touch xD)
Actually, I was thinking of asking for your expertise on something I'm working on. I've never been able to draw a very good concept of landscape, and I need to design a shrine for my book. I have an idea in my head, but I can't seem to get it to look right on paper. When I do finish the rough sketch, I'll upload it and link it to you (because it'll most likely be in my scraps xD) If you don't mind, that is. Yeah, I have msn I'll note you the address. ^_^
The action looks great but I don't like the color of the background, It seems like it doesn't fit in. If you would have given it a more greenblue color, or amore orange color it would have looked better.