Potential Scam

Okay, so I know very little on ethereum. Someone wants to buy the NFT ownership on 3 pictures my Dad has. The buyer is offering 1.5 ethereum for the 3 of them. This whole thing reeks of a scam to me. I am just curious if anyone in this community might have some knowledge on if this could actually be legitimate. I'm sorry I don't have a lot of information on the subject. I'd rather just know how this could bite him in the ass anyway.