Imagine he had drawn only the fish. Good fish, but it wouldn't have been eye-catching despite the really excellent shading/texturing job. and BY HAND if I'm not mistaken?
Now imagine he had only drawn the woman. Nice rump, could have done without the gloves actually. Not too many clean lines and yet a lot of clear shape... hard to do. But again, it wouldn't have been eye-catching.
Girl meets fish. MUST CLICK THAT AND SEE WHAT THAT IS ABOUT!
That is how you market. I am amused, and now that I'm here I've taken the time to notice how skillfully this was drawn. I would not otherwise have noticed.