Cool scene. It looks as if the slug caused quite an impression.
It actually made me remember a river fish I used to catch when I was little.
We'd go to the river and get our hands through the rocks and vegetation by the river bank. It was risky but fun. When the water was muddy you never knew what you'd touch.

_{We called it Guaraguara, they are of the Loricariidae family.}
I liked the composition of your art. The light effects are great.