Hi there!
Real sleek and solid work! And within an impressive time frame 
I love your concept designs, both for structures and characters, really no crits there… good work 
However, I do have a few comments on your framing and background… I think the angle you chose isn’t as dramatic as your concept. I think aiming the camera upwards and using a slight wider FOV would really help give a more “Epic” feel, especially with the ascending cyborgs…
Also imho the background matte you did is a bit too detailed… that and the strong color you chose make it a major “focus” point in your piece. I think a more subtle background would help bring out the characters and scenery…
Hope I helped, if only just abit…
Take care 