I like that you've went through and hand made your background but it could use a little more work. It looks like you went crazy with the smudge tool in the background, which gives a neat effect but it's too chaotic in it's direction paths. There are also random smudges intersecting each other which makes those weird wave patterns at the bottom under the last white line and to the immediate left of the front girls headdress.

There is a random patch of white lines up in the top left corner which doesn't bother me, but it might have been cool if you did some handwritten kanji up there instead to give it some purpose.