IMG_6802.jpeg - the main building should not be leaning
These appear to be mobile phone images, which suffer from lack of details due to a small sensor. Also, you should be turning the phone sideways from time to time to capture scenes in landscape mode which is often more appropriate than portrait mode.
At the Pisa Tower there are recognizible people - is it submitted as commercial? The vineyard - maybe the moderator sees it as private property. The night image is out of focus. Ponte Vecchio seems ok to me - but maybe it's too close to the windows?