Good Afternoon, this is my first posting and a brief introduction with a couple of questions. I currently shoot with a Sony Alpha 55, I feel like I have somewhat of a comfort level with the settings but still have a long ways to go with post processing. I look forward to learning and sharpening skills on both ends.
I've attached 3 recent photo's from Italy, always appreciate suggestions on how to sharpen photo's either on front or back end.

San Gimignano (Italy) from a nearby farm (overcast day)


Leaning Tower in Pisa, Italy


Steve and Lisa at the Colosseum in Rome, Italy