I am constantly re-arranging the art on my walls. Where should you hang your art? Anywhere! If there is room on the wall, then I say go for it. Don't be afraid to put a few holes in your wall and try it out. If you don't love it you can always change it. A little putty and some touch up paint will hide all of your failed attempts. If you're looking for a little more precision than my anarchist, poke-holes-in-your-wall-wherever-you-want method, then check out these hanging hooks
They might help you find the right way to hang a picture hook.