I prefer the portrait format picture, Wallace: the contrast is better; and the composition is tighter, and emphasises the bird. (The bird’s wings are in a more pleasing position, too, with better separation.)
The problem I had was that I couldn’t make out what the item was that the bird was hauling on, and I got distracted by trying to work out what it might be, rather than appreciating the lovely conformation of the bird itself! (Don’t let the dinner become more intriguing than the celebrity diners!) 😉
Sorry to disagree with you Wallace, but I agree with Ian and prefer the portrait format. I think it helps to show more foreground and with the bird being higher in the frame it gives a greater impression of it flying. In the landscape format I don’t think the left hand 1/4 is doing much for the picture and could be cropped for a better balance. Other may not agree of course,
Ian has mentioned the one thing which spoils the shot for me; the curiosity which the subject of the gulls attention raises. I take it to be some fish offal discarded from a fishing boat but, whatever it is, you are drawn to trying to identify it.
All things being equal a “full” PDI is preferable simply because it is bigger- club comps are as trite as that.
Thank you for the very interesting comments. The curiosity about the gull’s meal could be dispelled in the title as Herring Gull with dead Eider Duck. Do you think it is a bit too gruesome, mind you some of Ian W’s images are pretty blood thirsty, then that’s nature in the raw. The contrast is not as it should be in the landscape version. You are correct Peter the left hand side on the landscape image is not doing anything, but does look bigger than the portrait version.