Backlight no fill 
Backlight fill 
Sidelight no fill 
sidelight fill
I too these shots by using a window. It’s a cloudy day so there is mostly defused light. I used copy paper as a way to get reflective light. I think I had better results in the backlight because it was easier to still see the faintest shadow compared to the light of the main light scarce.
Good work.