live sketching of a skull

I bought this skull model from AnatomyTools.com, as recommended by Mr Jason Seiler.

The scale is 1:3, and it has a magnetic jaw. My son is so fascinated with it, and can't stop playing with it.:D

I have drawn many faces, but this is my first time doing live sketching of a skull.

It wasn't as easy as drawing faces, but I get to understand the structure of a skull better.

Again, I did this on iPad Sketchbook Pro with Pogo stylus.
This will be my sketch pad for fast sketches from now onwards.

After adding colours in multiply mode, I added another opaque layer to give some additional texture to it.