I really like the top half for the most part. I would wash out the colors of the background a little bit so that the sprites stand out a little bit more, but I don't know what image editor your using.
The bottom half is a mess as the only thing I really see is Samus, and Ridley sort of looks like he has two heads or something. The text also needs a border or something so you can actually see it.
--
"Go get me Jared...from Subway!" -- CM Punk
This line reserved for Rivalry Guru winner.