First off, i tought this was a topic to post "your" wallpapers, you could have named it "wallpaper compilation" or something to tell that it is not necesari to be made by the members and that others can upload too.
And please, don't post images as big as that directly, if you are using Photobucket to host the images you can do this:
{url=http://photobucket/..../file.jpg}{img}
http://photobucket/.../th_file.jpg{/img}{/url}
that way, the topic will charge little images and users can go look for wichever image the like iwthout waiting too much