"The jawline and neck are disproportionate. They have skinnier necks and less scaling around the mouth."

- I'd have to agree with you.

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Grammostola rosea 0.1.0
Pandinus imperator 2.0.0
Lampropeltis getula nigrita 0.1.0
Uromastyx maliensis 0.1.0
Rhacodactylus ciliatus 2.2.2
Uroplatus henkeli 0.0.1
Eublepharis macularius 1.0.0

I think a big part of the problem with the crested is indeed the heaviness of the shadow under the chin. It makes it look at first glance like the lizard has its mouth open and there is nothing inside.
But you do have a talent for detail!

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Merlin,
What's Life Without A Little Magic!