Eddie Mulholland, vice chairman of the British Press Photographers Association, told The Daily Telegraph that Michael Middleton's pictures of Prince George were "lovely snaps" but "not what you want for such a historic picture."
He said: "They are lovely snaps for a grandfather to have taken, but in terms of the quality, they are not really what you want for such a historic picture.
"I would be pleased with them if they were for me and my family, but they look like they have been taken with a mobile phone or a consumer compact camera. It would have been better to have seen it done properly given that this is the official record of the future king."
He added: "The photograph with the dogs is the worst. One of the dogs in the corner looks like a furry rug, and part of the Duke’s head is wiped out by a patch of light coming through the trees."
More top news
Employment Minister Priti Patel has launched a scathing attack on the government's 'chaotic' immigration controls.
Hanako died peacefully in a Tokyo zoo after living alone for 67 years.
A hearing found Kirsten Treasure guilty of 'shocking' catalogue of misconduct, including refusing to respond to a manslaughter crime scene.