I like ur background rocks theyre nice except the consistent single row of dithering looks weird.
front rocks remind me of henk neiborg which is good but ur probably aware the darker section has resulted in a bunch of loose cubes.
also rocks up front don't meld with background.
I'm mainly concerned with the rocks lol since its something i've been working on too (wish I had time to work on it!).
It all started with Henk Nieborg rock study for Pixel dailies on twitter. Most people liked it, and then I thought I could make a Mad Max mockup from it, because Mad Max is like the perfect movie for me. Then it all rolled from there.

I agree that dithering looks weird in some places. Maybe I should make another pass and get rid of it. Wasted so much time already on those bg rocks.
Black stuff up fornt is intended to be junk like barrels, tires and what not. But I didn't have time to add details yet. Not sure about lightning either, or what do you mean about "melding with background".
I've seen your rocky mockup, it just looks gorgeous. I can't match anything like that in quality yet.