Hello! I just want to be constructive with my critics...
I am kind of enthusiastic about animals and for me the most non-realistic thing is the tortoise!
The higher part of the shell (
carapace) is good, while the lower part (
plastron) is usually much flatter.
The head you modeled is lizard-like; moreover, tortoises have a sort of "beak".
The legs of your tortoise seem to have blisters; those are supposed to be scales!
For example this is Testudo hermanni, which can be found in SE Europe:
