There is no Yahoo Photos. It closed over a year ago. If you are referring to My Photos in Classic Email then read the following.
Items in "My Photos" and "My Attachments" in Classic Mail are just views of the original email. Deleting the email will delete what is appearing in those folders. It shows what is in the "inbox" and "sent items" along with any other folders you created. You can delete from "message view" in the photo or attachment folders but it deletes the original email along with the attachments.
Delete photos from facebook accounts by mnisbet:: Click "view photos of me" Click the only picture. Click "remove as profile ACCOUNT MUST ATTACHED WITH GMAIL/HOTMAIL/YAHOO. - ACCOUNTS MUST BE BRAND NEW, http://freelance.yuvaz.com/delete-photos-from-facebook-accounts-by-mnisbet-17426HOME