Terravesta - character concept art

Concept art for a new character created for a story I am crafting. Her name is Terravesta and she is an old, somewhat cranky and untrusting turtle. I would eventually like to make some comics about said character and story. The name of the world is not yet decided, but as a placeholder, it is named Caldera, who is another character within the story, and the main setting takes place within a colorful desert environment that is known for its strange rifts and portals leading to various hidden parts of the world. Terravesta is a loner type of character whos really only friends with Caldera, whos a mysterious undead cowboy. Together, they have partaken in some wild adventures, but, given her age, Terravesta has mostly retired from those days.