The detail and texture here is very nice, and I find the pose charming, shows the bill so well. Agree about the eye, just a bit of lighting. DOF very effective.
Might consider a small crop from the right side. Might try to smooth out the light band along the birds right side.
Very nice puffin portrait. Agree with above comments. I wonder whether the bird is oversharpened (particularly the head). I would desaturate the bill at bit.
Nice work on the exposure. If this were mine I'd try to place the subject's head further to right side of the frame. Fill Flash would have worked well to soften the light as well as add some catch light. Overall a well made image.
Would be nice to see the puffin looking into the frame. There are some small clipped white areas but nothing major and the reds in the bill are clipping a little.
Thanks for all of the comments. I recropped, and reduced saturation / sharpening in this reposted image. I also used curves to brighten the eye. I clipped the right side of the bird as not to have too much dead space on the left side when cropping.
Beautiful image and definitely improved with the repost. However I think you've overdone the eyes in the repost, even in bright sunlight these birds' eyes are very dark which presents a challenge.
The repost is definitely a stronger composition. I am unsure about the eye. Artistic descretion here--it certainly rivets you to the image.
Very nice!!