Technical Problems!

Okay so I'm finding that some are able to view my site with no problem, but other are finding that my pictures are transparent and the background is showing through. I think I've adjusted the background and hope that it is no longer showing. Please let me know if you are able to view the pictures clearly? Better yet tell me what you see:) This will help so I can work my html and make sure its settings are compatible with all computers. Thanks!