That's a great concept but you missed it by inches. The focus should have been just a little further back on the line of foam, whereas you have it just in front of the foam. If it weren't for that, this would be a great shot.
If the focus were stronger here, I could give it 2-3 more points. I get what you're doing with DOF but there's just too much of the photo that is blurred for my eye to grab onto anyhing.
Not enough contrast, the foreground is a bit dark, would have been really nice if you had focused a tad better towards the foreground and not so much towards the middle...