It's real easy, I will try and explain again below.
1) You need to get the userid. Find a user and right click on their profile photo and in Firefox click on "View image" In IE select properties.
2) In Firefox you will now see an address like http: //profile.ak.fbcdn.net/v22939/1565/10/n
12345678910_2569.jpg If you are using IE you see the url of the photo in the properties box.
3) That number after
n up to
_ (which I've made bold above) is the userid, copy that.
4) Paste it at the end of this address
http://www.facebook.com/photo_comments.php?id=
eg
http://www.facebook.com/photo_commen...id=12345678910
This will now let you see any of that users photos which have been commented on. Click on it, and then you can select to see the entire album.
If it takes you back to the home page either you've made a mistake in copying something, or the account is deleted.
If take you to a new page but you can't see any photos, either the user doesn't have any commented photos or their account is really locked down.