Visiting Firenze for a photo tour (Florence)

Ciao, amici!! I live in Guatemala, Central America, and I will be in Florence on October Protected content .

I'm a professional photographer and it will be my first time in the city. Any recommendations for sightseeing or interesting places that I have to keep in mind to shot a must-have photo? Any advise, help or even a coffee invitation would be gladly welcome! Thanks in advance!!

Mike