I've chosen a chinese/tibetan monastery in the mountains as topic for our internal concept art training at Meduzarts (www.meduzarts.com)
Entirely painted in Photoshop, I've started from a rough line drawing. I've spent approx. 16 hours, while recording the first 6 hours with Camtasia.
The original measures 3400x1692.
I'll post a higher res version on my website: [link]