The skeletal bones were drawn with vector software, then beveled to give the illusion of 3-dimension. The Thick Acrylic Round brush in Essentials supplied additional texture. To complete the scene, a landscape was added to highlight the irreversible catastrophe taking place as the rein of T-Rex came to an end. There would have been drama galore if the theory is correct that suggests an asteroid strike triggered a global environmental change; such an extreme change would have ushered in an extinction event which closed the book on Tyrannosaurus Rex and friends.
Has to be a lot of work to make something like this- head closeup is impressive in the details.