Skull Drawing - Nerve Damage buy

I had some time so I started trying to do medical illustrations with just a UltraFine Sharpie. Starting with pencil.

As with most things I start that are supposed to be buy realistic, I wander off that path into, well, what you get.

This illustration/drawing is on about 100lb stock. I used pencil and sharpie with a skull I found in a medical journal.

I do these illustrations when my back is not playing nice. The work nearly always ends being body or pain related.

Now I'm trying to make money off that.