pretty nice, but I recon the texture is out of line- not appropriate since there are canyons and cliffs in the bg and the tex makes the bunker seem a bit weird visually. But you probably weren't going for the realism so who cares anyway. Btw, you probably should make the opacity of the crater sceneries 75% or so, its better.
the sun scenery is pretty nice, but please do some more opacity experimenting- its a tad too bright.
I can make you make a better waterfall
, but this one is pretty fine anyway.
