Here is my first attempt at real matte painting. I followed a tutorial (again) to get to grips with basic concepts and I feel I was pretty successful, but there is still a lot to be desired. I also screwed up the buildings in the foreground as I can't figure out how to set the brush so each stroke is in front of the last, so I ended up with loads of layers (very annoying)

Here is the original picture -

These are from the Gnomon matte painting tutorials by the by...