Polygon colors are a bit bland
The map is not unbalanced; I think it's very well for an Inf. map, actually. If anything, it could be tilted in Bravo's favor, for spraying the wide open spaces to the top-right and 'nade-spamming that narrow tunnel. If I had that layout I would scrap the narrow chute underneath the Bravo base and keep the subterranean path going to the left, and emerging on the left side of the structure. Plus, continue the ceiling from the top-left all the way to the right, like inf_Outpost
I can't give any scenery suggestions because the atmosphere presented is confusing. It seems like a desert map but the given background colors try to force on it a jungle-environment. Pick an atmosphere solidly, and then we can go from there.