I think this title works well, because it invites the viewer to look for something that could easily be missed. This image is rich enough so that I think it would work very well also without a title.
Titles that don't work, in my view, are ones that lock the viewer into one reading of the image, when other readings may be valuable as well.
A few of the regular posters here on LuLa are good at providing titles that don't limit. Rob C comes to mind as one.
I personally find it very hard to come up with good titles, so I usually give in to the "utitled" cop out.
-Eric