I know you said you weren't done yet but heres my thoughts so far.
1) Back and Next are hard to read ( after you've already clicked on them )
2) Back and Next should be under the photos not way off to the right. ( big screen makes the buttons move way right )
3) I think you need a logo for Da' Party or a type treatment or something more fun than plain text.
4) Maybe rollovers for the pictures? Something to make them look more clickable?
Just ideas. I know your still working on it.