I love what you've done with the scale. The strange landscape coupled with the strange ruins gives the impression of a future so distant that even its most ancient relics were built eons after our time.
This is fantastic, but I'm gonna nitpick a couple things. The blocks in the distance look crisp and sharp when they should be receding into the haze. The glyphs on the blocks is the same line cut and pasted over and over, which doesn't make it look like real inscriptions. The snow or sand on the block is falling diagonally. I can't tell if that was done on purpose to add strangeness, but it makes it look like that part of the picture was arbitrarily tilted.
I really like the scale that you get with the tiny figure Also the concept is really nice the only thing that bugs me is the huge monument in the right corner (the biggest of them all). For me it ruins the composition and looks like it really doesnt care about gravity