Nice wingflap pose, and good job on the exposure - what looks to be dappled light surely helped you with that. I'm finding the comp a little on the tight side, and a catchlight would help bring life to the eye. Still very nice :-)
I like the pose but the eye looks a bit dead to me. If you ever go an photograph puffins in light like this I'd recommend using some fill-flash to bring some life into the eye.