For the desert temple I have tried to paint everything from imagination just with a use of references of tombs from Saudi Arabia.

The church sketch was based on some abandoned church somewhere in Russia. I wanted different approach so I have tried to apply the values more loosely with some lineart for definition.

The third picture is a functionalistic villa by Adolf Loos and with this one I have struggled the most even though it was the third piece and completely based on a photo. (: I have tried to do a rough sketch of lineart and values but not sure if I have achieved what I was going for. :D