Look at the template of your site is not genuine to be a wallpaper site instead it looks like an article site. To be more good looking with your domain .org why dont you spend some little money to buy a good wallpaper template? i see someone in DP forum selling his wallpaper script for only 9$. you should pm him to deal it.
he's right; it does look like a news site/blog. when i visit a wallpaper site, i want to see at least 20 thumbnails on the same page, displayed vertically and horizontally in at least 4 columns. that's true for any gallery type site i visit.
I've spotted a couple of things. Your header title is redundant. I understand you're writing it both ways for search engine optimization, but all it's going to do is make you lose actual visitors. Your header's sub-text is too close to the title. Add a bit more bottom margin to your header. You have way too many categories. Use tags for movie titles and categories for the first letter of the movie (e.g., you have an A-Z list and somewhere have a list of all movies by calling up all the tags. Simple, effective and clean. Your website titles appears twice on the 'About', 'Contact us' and 'Privacy Policy' pages. You don't really need a privacy policy for a wallpaper site, but that's just my opinion. Comments should not be enabled on the pages mentioned in my last point. Your search bar wasn't ease to find at a glance. Include a submit button. I think that's about it. If you have any questions, let me know. Good luck!