The temple is the result of a collaboration between me and a great artist Stem75.
He made the pencil sketch on paper. Go take a look on his great artworks in his deviant art profile here
I painted it over in an overly layer and darkened it in a multiply layer. i played a bit with indirect lighting on the eyes and mouth to make it more scary. selections, myst, clouds with brushes
Finaly added some texture to make it feel more rocky.
The first matte painting i tried to make. Here I used royalty free images from CGtextures.com to make the mountains and the sky.
Then painted with basic black and white colours the castle/city, added wall textures over them and finaly made overly colouring, clouds and lighting with brushes,.
Overall time: 4 hours with Gimp and Krita