Rough Draft - Comic Cover

I've been working on a cover for my new book of collected comics. This is the rough concept design. The characters won't be 'see-through' as they are here - I was just trying to figure out placement. In case you can't read what's under 'Hot Donut Salad,' it says, 'and other strange concoctions.'

Next step is to draw it in pencil and then ink it. Then color it in photoshop. I think the background is set. I like it. It has the groovy vibe I'm looking for. Any thoughts or suggestions would be much appreciated!