I've given 4 before, but have increased it to 5 now that I'm commenting. The drop stands out from the rest of the picture and looks very good. The remaining of the picture however looks washed or artificially over exposed. 5.
What a strange picture! The water capture is terrific, and the clarity in the round drop pretty good. But the rest of the shot seems rather murky, like the "before" view in those old polarized sunglasses ads.