The messages arrive while you have your hands full, and by the time you answer, three of them have booked somewhere else.
Bookings on your own site mean a client can choose a slot at 11pm without you touching your phone. You stop being the booking system.
A gallery is not decoration for a salon — it's the entire reason someone picks you over the place next door. Put your best work on your own domain rather than only on a profile that decides who sees it.