Original image

step 1 of 10

step 2 of 10

step 3 of 10
Masked clouds where neccessary.

step 4 of 10

step 5 of 10
'Broke' some of the pillars using mask and clone.

step 6 of 10

step 7 of 10
Also created some cracks with the brush tool, as well as 'broke' the one window and added light ray using brush and blur and oppacity.

step 8 of 10
Used channel minipulation to extract the tree.

step 9 of 10

step 10 of 10
Added some more colour filters.

Final result

