These are some rough quick concepts, nothing polished!
*ALL CRITIQUES ARE WELCOME AND APRECIATED*
Give it some flare by pushing the warm and cool colors. Compositionally, I think the top one is stronger than the bottom. Also, there are 2 focal points in the bottom one - the jets and the lights in the tunnel. Easy fix if you just pushed the jets back in value to lessen the contrast, and maybe even shrink them a bit to sync up with the atmospheric perspective values you have set up.
wow nice stuff, love the way you lit the rocks in the second one, its subtle but you described the form beautifully. The jest don't bother me too much, i kind of like the back and fourth that's going on between them and the lights above the door. Can't wait to see more
Great start, showing some real potential there. From looking at your top piece with the soldier in it, it seems that you could do with some anatomy practice as the figure seems a little ridged. Also as mentioned, some warmer or even just more pronounced colours added to both of them pieces would be them out no ends. Anyway, great start and can't wait to see more!
i saw your video's on youtube, like the tutorials and stuff. Great to have you here man!
and great start on your sketchbook.