4-6 good photos is the sweet spot

probably yeah

Depends on how good your photos are but its better to have just 3 great photos then to have 3 great, 2 good and 2 decent ones

You can never have too many photos. but it’s better to have four really good ones. than 8, with 4 really good ones and 4 bad ones.

Yup. Keep it simple. 5-6 is the sweet spot

4-6, i'd say.
8 pics can come off as too keen, try hard.
Unless you have a really cool life style and can show 8 different pics...