I liked the shots Fire and Postcard because I appreciate the nice action shots with some jokes mixed in. I don't know exactly how you made the fire one, maybe grenade explosion? But it looks nice, not too much going on, but it's bright and looks pretty tight. Some of the other ones seem kinda bland, like "top". It's symmetrical ok, but there isn't anything going on, nothing really to look at besides some jackals. I don't know exactly how you could add more in because nothing seems to be going on. Postcard is just funny, I can see the caption being something like "Don't forget your guns!" Nuff' said.
I like sky. I think it really captures the feeling of OH SH-. It's so peaceful though... Almost like a trance...