Your very low punctuation is only for the fake fruit bats (not perfect, but decent) or also includes the fake plastic branches and leaves?
My score of 2.5 is just for the fake fruit bats as per the description next to 'What is it'.
I wouldn't worry about the scores too much as they are just people's opinion rather than absolute fact
A nest in rotting vegetation (or in fake rotting vegetation) would be extremely difficult to keep stable or to replicate, and would be much less visible. But the crocodile nestlings would look more realistic if were not a deheaded one here
I'm not suggesting they use real decaying plant matter, although a pile of dry reeds or grass could suffice as it would take a very long time to break down unless it got wet.
I don't think a fake alligator nest would be too difficult to create and it could demonstrate nicely the camouflage of the baby alligators emerging from the nest when they are most vulnerable to predation.
I think the one without a head is actually supposed to look like it has its head in the sand.