I'd say this is a bit dark especially for a desktop, but mostly the image isn't sharp. It as an "old photo look" to it, wich gives it a kind of mysterious aspect...
Your other images are icredible. I like this one too, but it's a little more understated. I kind of like that it's out of focus at thte edges, and only the rocks and grass in the foreground are present. I also like that it's dark, since it makes my idons stand out better. Nice work!
I like b/w and some of the elements (wheat or grass) in this composition could lend themselves to something a bit mysterious or moody. My problem is, however, that although I think I can see something in the center of the frame, it's hard to tell exactly what it is - the pile of rocks suggest possibly some kind of garden or concrete sculpture, but it's too vague to tell.