We went to get my husband's photos on Tuesday, as our interview was Wednesday. When we got to the place in London they said requirements had changed - they are no longer requiring that 3/4 face, show your ear kind of photo, they now want you to face straight on.
So if you've got your interview soon and have the old photos, it's worth getting them taken again. I don't know if they'll accept the old kind anymore.
The law changed in the beginning on August, the 2nd or 3rd I think, the photographer showed us the official Embassy thing to prove to us that he knew what he was doing.