I like the first one and the last one, even though it's a bit blurry. The crab one seems a bit sloppy I like the abstractness of the crusty stuff in the first one.
two things,
It looks like either the lid that you used to make the planets is a bit flat, you want to use lids with a sharp lip, not razor sharp, but kind've sharp, gallon ice cream lids work well.
and make sure to add stars either when the lid is still on the painting, or after it's dry, then putting the lids back on, that keeps em off the planet.
Edit: I would also recommend glossy poster paper, because I've noticed that bigger stuff looks better and glossy is easier to smear.. I can get about 10 sheets for cheep at the dollar store, though if you plan on selling them I would recommend something not acid based, because the poster paper that is acid based fades the paint after a time.
