I'm just glad to see someone else reading a real book, in this hyperdigital attention-challenged era.
You could've added a bit more depth to the picture, either with a but more detail for Yellow or with less for the background. It's good overall...admittedly if you painted this with markers, fine detail might be tough to achieve. I also like seeing this as it is in trad media, instead of being done entirely in MS Paint or some other program! Keep it up, man.