Hello Wishmaster, welcome to the board
I have never been a big fan of backgrounds like that... think they make the page hards to read and messy... but that is just a personal opinion, and probably wouldnt stop you getting listed anywhere.
Chris has given some good advice there... clean up the mouseovers so they are consistent across the site. The large add may be considered a full page ad as it does take up my entire screen. Prehaps try mixing it up so you have gallery 1... your ad and then gallery 2.
Gallery 1 - I am not a big fan of pics surrounding ads like that... once again just a personal opinion.
Gallery 2 could certainly have another sponsor link
Good luck with it