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Initial Feedback:
The swimming lizard is a good start. The animations are pretty good too, except the head is a
little stilted. Try varying the speed of motion - could it move faster/slower?
There's something missing in the translation from 2D sketch to 3d model. I'd experiment
further with the proportion, really push everything to an extreme to see if you can improve
on the overall composition.
Then focus on detailing the model. how does the crown on the neck fold. How big are the
claws? How thick are the fins and tail? Don't be afraid of asymetry.