Here is a cleaned up version of your file.

I just created a nurbs cylinder to make the basic body shape and leg shape.

Then converted to polygons, attached.

Pushed and pulled verts and edges, added an edge or two.

Extruded the mandible things.

It is about 700 faces (1400 tri's).

It took about 20 minutes to generate. This would be a good starting point to add detail.


Things to note:

I modeled this based on your maya file, so no eye geometry and simplified foot geometry.

I changed the geometry to make it symetrical, so it can be split down the xy plane and can be worked on one side.