I've said it before and it's worth repeating... Those three colour sketches are so satisfying and clean, like something straight from an art book.
And that render at the end is improving well. I really like the mood and atmosphere of this one I wasn't exactly sure why, so I've just trawled back a few pages to compare with previous versions.
I think the transparent "hologram-style" effect on the yellow structures works much better than the more solid rendering on some of the previous ones and doesn't overpower the rest of the machine.
Also the extra distant detail on the right really enhances the sense of space and compliments the central glow that immediately catches your eye.
Keep working those details, crank.