Recently, I have been drawing dinosaurs on my iPad, using an Adonit Jot Touch - a pressure sensitive stylus.
The dinosaurs are taken from my photos of a range of plastic toys made by Invicta Plastics, and sold in the Natural History Museum in London (as well as other places - they were not exclusive to that venue). These models are no longer sold, as they are inaccurate based on current thinking of how the skeletons were arranged, amongst other things.