Cute Yoda Coaster

So I made this for a coworker...I don't recall exactly why, but some Star Wars quotes were getting thrown around the office, and when I got home I was inspired to make this. I used this tutorial as a drawing reference. 

The coaster is just a promotional cork one with some company print on the other side, and I used a Sharpie pen to draw on it. No need to seal it or anything! I've done this before and I've never had a problem with the ink running.