Yeah, there's a classic cover shot of Aquaman enthroned - maybe '80s or so? - that I used to have, but I've just spent the better part of an hour trying to hunt it down online and had no luck.
Since Aqm's got long blond hair and holds a trident, and sat in a similar pose on a throne--I forget if the back was shell-shaped or just generally sea-themed--it looks similar enough to make me blink, but not enough to be either ripoff or "tribute" enough to be a problem.
If you happen to know anyone who remembers lots of DC covers of that general era, you can always check with him; unfortunately, none of my current friends are real DC fans, and they're a little too young as well. Aaargh!
I had seen this cover and was so inspired by it! And now i find the rest of your work! Amazing! I'm a body painter and I've been waiting forever to attempt recreating this character in the flesh. I finally found the perfect model and we'll be giving it a go at IMATS Pasadena in january! I hope that i can do the image justice!