I learned something when making this pterodactyl. The open mouth invited teeth, so I looked it up to see if the creature actually had them. Yes teeth, but
no to bat-wing shapes. Because at first he looked like this:
It was inaccurate. I had spent quite a bit of time putting those wing fingers in between the membrane, and carefully aligning them to the corners. My initial sketch was inspired by a toy figurine, which had the bat-like structure. Should have done the research first! I had to redo the wings.
