As of now The Changeling's Sister has two chapter covers. Basically how I see a chapter cover is a summary of the whole chapter in one image. It might not be understood when the reader first see it, but looking back it will be more clear.
The first cove I made was to illustrate the relationship between the sisters in the story
(I later redrew it as a cover for a physical print out. Still like the energy of the first attempt better though...).
In the second I wanted to illustrate the main character's start of her journey down the, if not literal then figurative, rabbit hole. I kept the thorn frame from the redraw though, cause I liked the cohesiveness it gave.