Maybe cover that wall in mirror, that would create a neat effect of the promenade going on forever rather than just a dead end.
I agree that the tornado shaped sculpture is a too big and too close to the building -- it should be placed at the opposite end of this corridor. If I had one of those east-facing townhouses nearby I would be really mad that I would lose the water views, but it would really nice if they were softly lit at night when the view to the water is completely dark.
Overall I think these sculptures are one of the better public art pieces I've seen used on a condo site.