Mr R.,
I agree with you - the far away shot does look a lot more convincing that the blown up versions. I admit that any photo blown up enough ends up looking like a muddle of blotches, even a perfectly normal snap.
The thing is, like Jenny Randles mentioned in the link, what about the surrounding photos on the film? I wonder what they were like/of?
The story of the policeman - does he remember taking the photo? If he deliberately took the photo, you'd have thought he'd taken more than one, as the creature moved down the path?
I don't know if it looks particularly 'fake' as in deliberately set up to deceive, as it could be a simulacra that he later misinterpreted. But if he was a policeman he was hardly going to put his job on the line by owning up to some bizarre 'aliens kidnapped me' story without some serious soul-searching.
Could he have had some weird temporal lobe twitch just at the moment he spotted the 'figure' and incorporated it into his fantasy, rather like how you incorporate sounds in the real world into your dreams?