Is it called fan art when it's for your own stories?

In my slack and idle wanderings today, I decided to practice my digital painting. To that end, I decided to see if I could paint a scene from CALLED, the book I'm currently writing. This is my sad attempt to do so, as the hero Slan rides his dapple war horse into the wild lands of Gunsail Nam, and he and his companions that I was too incompetent to paint see a trio of giants walking on the horizon. This is shortly before one of the heroes does something dumb and the giants decide to thump them.

This used no references, so for that at least, I'm quite pleased with it.