I'd recommend varying the cliff so it's not just a straight line, which is extremely unlikely to be found in nature. Also, try using the other water tile (the one next to the one you used here) to make underwater cliffs - that's not a stony bottom but actual underwater cliff walls.
I really like that parallax! The colours of the moon are quite lovely. Your tint is also really nice! Too often people go either too blue or too dark.