Dragon, maybe something you aren't understanding is what makes a shadow, A shadow is a difference between light and dark. For example, if you stand infront of a white wall, you will have a VERY obvious shadow, however, if you stood infront of a tuly black non reflective wall, you would not see it at all. Now, the same principal applies to those two pictures, the grey one actually has a darker shadow, but you don't notice it as much because of the dark color.