If one of the people who gave an 8 would have given a 2 it would be a perfectly symmetrical voting curve That would have given you exactly a 5.0 (don't know why I feel compelled to point this out) I guess I just find it interesting that just as many thought it a 6 as thought it a 4 and just as many thought it a 3 as thought it a 7. I guess it shows that average scores do not tell the tale of an image. For 72 people this image was above average. The glass is a tad more than half full.
Not liking the technique of double exposure. Seems to create a relatively uninteresting image, though the linear technique does add compositional appeal. Black and white was a good choice for this shot. Color would have made it even more uninteresting.