Skulkrassic Park(Or a rather simple lizard looking for advice and aid on improving his craft)

[Skulk-Fossil]

Hello! Im skulk, and after much waffling decided to purchase the new seraphon vanguard box.

Ive got a few questions i hope yall could answer. Now, i know the box makes you choose between carnosaur or troglodon, but i think i have the right parts to kitbash a body-what the dismensions of a troglodon/carnosaur?

Now, my second question.
Does anyone know any tutorials or techniques that would let me create skin patterns like the ones in these pictures?
https://twitter.com/storm_spino/status/1629796430230573056

I really appreciate any help!