I had fun working on this! I used my fingers for the glow around the fireflies.
As I read the prompt, and looked up for some reference I came across articles that spoke about the extinction path the fireflies and in general glow worms are headed towards. One of the reasons is light pollution, If you see my thumbnails, you can see this thought has taken prominence. Naturally, I started to think of this as an editorial piece.
I spent about 3hrs painting this, a very short time. ( I spend days on editorial illustrations) Though I am happy with the outcome, it's like a small color study for a possible future finished work.
Materials: gouache and color pencils