Here's some practice work for prehistoric sea creatures can ya guess what they might be?

For anyone wondering how I draw and make my drawings work better I practice like this marking what looks good, what looks wrong, what looks in between and can be made to look better.
✓ means I think it looks good and keep it and keep practicing it
× means it looks bad and try again
? Means unsure

Since it's been awhile since I've posted anything and had people doubt that I'm a spam account I'll be posting every now and then so here's some crocodilian heads I've done just last night

Hi this'll be my first actual post on here so here's this! I call it the Gorgon Crawler. Based on:
Jurassic world Alive Gorgosaurus
King skull island Skull Crawler
Blue undertail lizard