Interesting idea. The background has seams in it that kind of make me think it is a skirt or something. Next time you might want to purchase some black velvet or even just some colored paper. The lighting isn't very good. It just looks like you used the flash in your camera. The shoes have shiny hot spots and the color lacks depth.
Simple is almost always best! Great shot...I adore those shoes. Very sexy! The fishnets are a great touch as well. Nicely done, meets the challenge well with or without PS. :o)
Really excellent choice for the desaturation challenge. My only nitpick would be that it seems like this shot would be better with a white background. But I love it just as it is as well. Nice job!