I'm with squiggle and cc. Out Of Our Heads for sure. A more defining moody image of a rock'n'roll band is hard to imagine. The whole session taken by Gered Mankowitz in London is amazing.
Look at Brian - clearly still the leader of the group at the front of the photo. And Keith, so effortlessly cool and nonchalent.
Then there's Mick, trying to break into the photo but on the edge while Bill and Charlie look on menacingly. I'd sure not want to meet a bunch of guys looking like this in a dark alley.
The photo is the complete opposite to the sweet images on The Beatles album covers around this time. It's a masterful picture and remains one of the best album covers of all time. Punk 10 years ahead of its time.