It began as watercolor and ink ideas.
I decided to refine the sketch and move the action away from us a bit, to show more of each character.
The first job was for me to define the areas so I could concentrate on who was where in this entanglement.
Then some color and shading on about 5 layers in Painter IX and X. I also made a change in the leg positions.
Finally I added some seaweed and darkened the sea a bit. The final will have text at the bottom and maybe a few more bubbles with more clarity.