I hated torterra's design in the pokemon games, juts they way they represented him. As a pokemon I don't like him. BUT, my image of him as a giant walking turtle (like gigantic walking islands) in a fantasy setting more. how cool would it be to live in a forest on top of a walking turtle!
All head-cannons aside, this is a very nice piece of pokemon artwork! just like every pokemon artwork you do, its fantastic.