I have seen this done with old photos, but this is the first time I have seen it done with drawing.
It would be good to see people overlaying dramatically different scenes. In the meantime, there’s more at Drawing Within a Photo – ReflectionOf.Me.
Drawing within a photo
Smart People I Know 
oooh i like that – very cool, it has given me an idea! 🙂
Excellent. We await the results!
wow, thats awesome!
thanks. I think it’s cool…