I tried another way to do the jellyfish body. I painted the silk gauze bright yellow, and "stuffed" the body with the folded under silk gauze. I outlined the body with stem stitch. It looks somewhat muddy, so for the final version, no painting.
The final (maybe) version. I trapped the angelina lace under the organza, to tone it down and give the water a subtle shimmer. I did not stitch the outline of the jellyfish with floss, as it made it too heavy.
I used Paint.Net to "auto-adjust" the color of the photo, it looks great - too bad it's not real! Maybe I can use that for the color scheme of the next version!
Enough jellyfish for now - I really have to get back to my Japanese embroidery, and finish up the Hydrangea.