That looks adorable! I love the little Kirby-type guys living inside it!

This is a little more advanced, but there's a theory in art that circles look 'unthreatening' or 'approachable and cute' to the viewer; rectangles look dry or informative and nerdy, and triangles look sharp or dangerous. With that in mind, you've made an adorable little moon colony (or possibly a village made out of Cadbury's mini-eggs, scale notwithstanding :P).

Looking forward to seeing what you come up with at the art-jam at FF this year! :)

D.F.