Yesterday I made a post asking for help choosing a picture to put in the WWPW competition. From everyone that helped me I was able to narrow down my pictures. Having other people look at my pictures helped me see things that I didn't notice. I am asking again for the same help.
i think 15 is your technically strongest photo and the interesting POV makes it stand out. I think you could tinker with the lighting on it to brighten it up a bit and add a little more contrast to give it a little extra oomph.
http://www.flickr.com/photos/everything_under_the_sun/sets/72157631775309153/