Saving someone’s photo/avatar from yahoo messenger is so easy.It can be done several ways without installing any software.Here are some of the easiest ways.
Method 1: Save avatar directly from yahoo server.
Visit below link after replacing yahoo id of which you want to save avatar/display image
Method 2:Open chat window of the person.As you can see display picture press “Print Screen” button.
Go to Paint.( Shortcut:Start—>Run—> type mspaint )
Paste the image by CTRL+V
Crop the picture and save it.
Method 3: Navigate to below folder in My Folder.
Rename and .jpg extension to all files till you get desired avatar.This trick is useful when the person changes avatar and you want to get old avatar of a person.You may save up to last avatar of yahoo messenger.