Just had a quick look at the exif info, camera canon eos d60 (old I know), with lens at 300mm, 1/90s, f5.6, ISO 100. Wondering if it may look a little darker with the position of the sun (all the light appears to be on the back of the head). Still new at all this but would that also cause lens flare?
Forgot to mention the image hasn't been cropped, but resized to make longest side 800. Just lucky that it came in really close (within touching distance almost) and got this. Will have to have look through the rest of the pictures see if their are any that show just how close the wildlife will get in the Falklands (got chased by penguins!!)