He is corporeal, a spirit being, he can take on any form he wishes- including that of his original beauty! So watch out everyone
In the Garden, he could have been a serpent, though he was always a serpent because he is shrewd and cunning (characteristics oft associated with snakes). In the Garden he was already a fallen being, yet he was cursed afterwards as well. The ultimate judgment awaits.
And I will put enmity
between you and the woman,
and between your offspring and hers;
he will crush your head,
and you will strike his heel.” -Gen. 3:15 the 1st foreshadowing of a Redeemer
Yes, Genesis 2 mentions the Tigris and Euphrates- Mesopotamia- where the Garden was located.