I have to feed my dad's many cichlids whenever my parents are out of town. I also have to remove any deceased fish before they casually get chewed up by their living neighbours.
I wanted to draw something foreign and initially frightening in a little fish environment. Just like when they move into a new tank, the fish would first be uncomfortable, then curious -and eventually they would get used to the new environment altogether and (in the case of cichlids) start burrowing. The girl had been passive (or dead) for so long, that she had just blended in perfectly to the surroundings.
First I see the thumbnail and think, "Aww, that's cute, it's a girl underwater surrounded by fish!" And then I see the one little fish swimming into her eye socket and others popping out of her neck and torso...and I find it even more whimsical while being a little creeped out