Nah, it's fine, seeing as how it's your game. I wasn't really sure how you wanted the two larger sprites so I just split them into two (as you can see). The sprites for the guy look, well, I don't know what he is supposed to look like, so I can't really say. I guess I'll have to play the game on my free time to find out.
EDIT: Yeah, they look great. Also, found out that the tank is named SOPHIA. Pretty cool.