Article by Jimmy McIntyre:
You may be wondering why a photography site for landscape and cityscape photographers is including tutorials on composite work. We can learn some wonderful techniques from composite artists who usually have an incredible depth of knowledge when it comes to Photoshop. One of the best sources for composite tutorials is PSD Box, which I highly recommend.
These two videos will show you some wonderful colour control and lighting effects, as well as a few extra tips that you may find useful.