Are you supposed to tip photographers?

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Current Events » Are you supposed to tip photographers?
Im paying a photographer $675 for newborn photo shoot; this will be my second time going to the same photographer because she did a fantastic job the first time. I mentioned this to my coworkers, and they asked how much I tipped. I thought they were joking and laughed, but they were serious. Apparently youre supposed to tip photographers? Im paying this lady $675 to take a bunch of photos and I need to tip on top of that?
https://i.imgur.com/XNEdLrJ.png
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Current Events » Are you supposed to tip photographers?