Coooooool...!
This looks lovely - makes me want to practice more backgrounds. Your atmospheric depth is on point.
Something about the top half of the image feels too clean to me though, in comparison to the intricacy of the ground, the solid blue sky is almost distracting. I would almost say you could do without so much free space up there, but that's just me. Obviously this is still a very stunning animated art piece and you know what you're doing. P:
Keep it up!