Dimetrodon exhibit in progress

So since it has been quite a while since my last update I decided to give a small sneak peak of what I'm working on.
Here you see one of the three exhibits that I'll feature in this piece. I'm thinking about buying a fineliner to trace my work just because of the shear amount of detail that I want to put in it. Let me know if you think I should do it or if I should keep using pencil lines.