Upload & Sell: Off
"no way to.."
That is the challenge, or part of it.
I like photos showing a child looking at something (or out a window).
Given the unusual nature of the "underwater" setting, I think showing some underwater life is essential for this kind of shot to be strong.
That said, when one sees a photo of a child looking out a home window, one can immediately imagine what they see (or feel it), as that is a shared experience we have all had.