Well, it's not always so easy finding someones photo in the first place, is it. In that case here's what you can do.
Here are three ways of finding people who may have accounts on Yahoo: http://members.yahoo.com/
Or you can go to your Yahoo Pulse page http://pulse.yahoo.com/ and click Find People, it's right next to your name. A search box will open for you to type in their Yahoo user name, after which you just click on magnifying glass icon or hit Enter on your Keyboard.
i think you just click on the picture
just click on their name or picture
Hope my answer helped =D