Yes, PHOTOS is a Scrabble word!

Letter values in Scrabble US: P 3, H 4, O 1, T 1, O 1, S 1.

Is it a valid word?

PHOTOS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a representation of a person or scene in the form of a print or transparent slide; recorded by a camera on light-sensitive material