Fish Demo step 1

I began by laying a 22x30 sheet of clear acetate over the existing work, and drawing with a brush the grouper fish outline and coloring the left side and botton with solid blue just to see if the composition would work.  In this image, I've drawn him with black Tombow brush pen and put in a pale green wash over the left side and bottom to get a feel for the water.  I will probably leave the vertical and diagonal parts as seaweed.