Time of day, quality of light?

I keep trying to get the look of being  carefree in the reflection of the window. I'm just lying on my stomach in bed with my lower legs up and toes pointed outwards and my heels tapping together like, I don't know, dolphin fins flapping & that sort of thing.

But every time I try to take a shot, the reflection just ends up looking like a creepy ghost in the shrubbery.