@Oceane_Roh, @nesokaiyoh Thank you for your comments, and yes I think your idea of the shark tail of the mermaid going to the distance, and the "summoned" shark coming to the viewer would be great! But at this stage I don't want to go back and redraw everything
so I'll stick to what I have and I'll try to make it workt as best as I can. But I'll definitely consider your feedback for future illustrations, so thank you again!
I did some progress with colors, I'm thinking in having the scene underwater, as I have never done that before, I'm approaching it by painting normal color first and afterwards tweak them and add some effects to make it work.