Very good, I'm gundam fan too.
My suggestion is to redo the make add digital background to look like the interior of the lanch area.. use very...very little Cotton to simulate thin smoke behind RX-77. And add little amount of "motion blur" behind RX-77 if you have photoshop. I think it will make
RX-77 like is really in action.
Anyway check out my earlier Gouf photo. http://www.dcfever.com/photosharing/viewphoto.php?photoID=13929