I know, what you mean. Actually there are no clouds obscuring the sun, so no need to drill a hole in the clouds. I tried several sun positions, and this was actually the one that had a nice balance between light and shadow. Positioning the sun to a place similar to Dirk's suggestion created a very dark and shadowy image. I'd like to keep it realistic, so I won't use second suns or such things.
But I'll keep on trying...