Often when using seamless we are almost automatically placing the model far away from the background to create a shadowless shot.
However it can be very dynamic when you place the model very close to the seamless and let her/him start playing with the shadow that is cast, in other words make that shadow part of the shot, but when you also add some aimed light (in this case an Elinchrom 1.00 mtr Deep Octa with grid) and some motion and expression you can have a striking shot.

 

I converted the shot to BW to give a bit more of a rough edge.