Looks like the same girl two to the left of SADO in the top pic as in front of her in the bottom one.
Playing with different tinting and texturing of the same picture was the fad back in those days. Seems like everyone and their dog thought they had to have an in-home film processing table and a spare closet. Yes, I know school pictures would have been taken by a professional studio but just saying... That falls in with Davis thinking he’d strike it rich in the exotic picture trade.
Forget Davis, he couldn’t be further from this issue if he lived on another planet. The tweaking of the high school images points directly at a member of one of the relatives of a student.
And yes, I think I made it clear the girl second from the right in the back row of the ‘no sweater’ image is the same girl as is seen holding the book in the french club image. She’s been identified by her own daughter.