So, welcome back, and I hope you'll post more often. Very worthwhile to see, you've got it in your fingers.
I agree with Jordan; the eroded stratified rocks in the top left seem out of place. I think if you replace those by 'more ordinary' rocks, or put the more distant and much bigger, it's more realistic. And I would get rid of the one small central darkish cloud.
But I love the bones and the way you wet them up.