light through the broken roof

for the group Tips & tricks (Mat Fot's invitation): again its an HDR of 3 pics, I made an extra B/W layer, which I overexposed with strong contrast and set the layer to "luminosity", next step is a "cross processing filter" which makes the yellow green colors. The part at the roof with bright light is treatet extra with low contrast and "highlight structur" set to zero in "Color Efex pro", finally I made the pic a little bit darker to the border.......