Beginner

He motion tracks the head onto the table, I think he should of used a smaller paper, and a model that would hide the paper.  If he used small tape with dots, they might of been easier to hide also. A little planning means less work later.

Plugins that make Reptopolgy easier

Here is a list of most of the better add ons.  Notice decimate is the first one and is included with blender and simply reduces the amount of polys in the mesh. (Very useful)

Good reference of dinosaurs running.

Nice walk and roar, if you rig your lizard well, you can do this type of animation.