Try reducing the distance between the figure and the backdrop object to about 2 feet.

... AND ...

If the infinite light is too bright, it will "wash out" the shadow from the spotlight.

Try turning the infinite light off and render it to see what effect you get.

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Remember ... "With Poser, all things are possible, and poseable!"

cheers,

dr geep ... :o]

edited 10/5/2019