SEO Techniques for Wallpaper site

Hi fellow!
You asked a lot of questions. I think you have to post daily according to your data. You can create back links for better SEO results. You can also use guest blogging services to get traffic on your site. You have to use the keywords with high volume. You can promote your page on facebook for getting more likes.

Have a look at optimising for Google image searches that's normally how I search for wallpaper

Also are you putting these images in your sitemap XML?