I am sorry, I can not help feeling that person is a Windup Merchant.

Who in their right mind would render in Preview MODE and even be happy with it?

Handpainting Shadows?
By the time one has handpainted the Shadows the Render on highest Settings will have done a great job lol.

Edit : just looked and josterD does not even have one single Picture in the Gallery, makes one wonder. hmmm