Every time I come across a topic on Illustration Friday I try and draw the first thing that comes to my mind. So, the first thing that I thought of when I saw 'Slither' was 'Slytherin' from Harry Potter. Then I thought 'Salazar Slytherin'. So, I drew Salazar Slytherin.
Yeah, it has nothing to do really with 'Slither', but whatever. Enjoy.