First of all, sorry it took me so long to respond to your post! University has been crazy a bit, but I'm finally getting around to it!
Second, this is brilliant
I think minimalism can be so creative and expressive--you definitely nailed that here. The colors are nicely balanced, and I like that there is this symmetry with all the roundness going on.
One thing, I think that if you were to stretch the meaning of minimalism a bit, there could be a bit of green in earth. Just to emphasize that it is Earth you're looking at from the moon--it's pretty clear here, but I think that extra detail could help. Although it may contradict the minimalism...anywho. That was kind of a fail critique. Moving right along!
I love the crinkly texture--how did you achieve that through digital media so well? It looks so natural!
Great piece, thanks for sharing!!