The blue "window" is a particularly nice, diverse element. Interesting how people cast shadows almost as tall as the columns... maybe it`ll be worth to consider a crop of slightly over an inch off the right, to make the composition more focused? I know that you`re probably not a fan of significant digital manipulations, but I`m curious what this might look like if you "clone out" the people and leave only their shadows... Too radical, sorry )
I like the "blue window" as well. If only the darn tourists were not present!! I know that is almost impossible, however, I think it would make a better shot! Also, the vignette in the upper left corner is distracting. Nice shot! Beautiful colors and composition!