If the light is suppose to hit the tops of the bushes why not the bushes in the center? They are not light green like the ones on the end. Could be a cloud passing by????
If all the grass were in shadow from the setting sun why do shadows appear at all? You cannot have a shadow within a shadow.
Artificial light? Where is the light coming from and why isn't there shadows cast from that?
Dusk?? Why the lightness in the eastern sky and darkness in the west??