this was actually one of my 1st paintings and I used a little too much paint for the planets.. (noob mistake lol) I haven't had a problem with that for about 2 months now.
Nice work on those clouds, but like Tk said you gotta eliminate those rings! Use less paint round the edges or leave it to dry a bit longer before putting the stencil down.
clouds are nice. They have a certian... cartoonish feel to them. Im sure you know but I see nasty rings on your planets. I get them sometimes too. There are a few ways you can get rid of them. You should read through the forums to learn them.