24 May 2021, 05:02

If it were me I'd put a piece of tracing paper over it and try different ways to put some shadows in. (hatch, cross hatch etc. ) As it is now, you don't have a light source. Once you decide that I think shadows and more mid to dark tones will make it more three dimensional. You might want to research other blk/wht illustrators that tackled underwater scenes to see what worked for them, it's not easy probably why I've never attempted it (tee,hee)