It's a portrait by photographer Piermarco Menini, done in Venice in 1997 during the Venice Film Festival in which Robin won the Volpi Cup as best actress for 'Niagara Niagara'.
HQ photo can be found on Menini's Tumblr, HERE
Source: Piermarco Menini
This little blog of mine is getting older and older! :) I cannot believe that in just two more years it's going to be ten years since...