thanks both for the comments, George7 the spiral staircase is at the exit of the Vatican museum.
JC - much appreciated comments
the shot of the Trevi Fountain (2), getting a daytime shot with the crowds is nigh on impossible, the certainly don't take any prisoners! repositioning, well not an option i'm afraid.
Colosseum 3 - agree about the tree, any further to the right and there is a lamppost - so lesser of two evils.
4 - the Vatican, again a compromise. There is a pedestrian area leading to the road to the Vatican, its the only place possible to stand without being run down! But its the only vantage point for a head on shot.
5. stairs, end of long day on our feet, was happy to get a shot and move on
6. was torn between the sculpture and trying to get the domes between the flags - obviously the flags won!
much appreciated feedback and critique though, helps improve us all