Photo-manipulation has taken many forms over the years. The latest trend involves using several stock images to create a composition. There are a number of techniques that are useful for this, but the most important thing to remember is that you need to pay a great deal of attention to detail if you want to convince the viewer that they're looking at a realistic landscape, no matter how surreal your work becomes.
You can only do this by studying the real world around you to get a feel for the factors that will affect the look of your piece, such as lighting, shadows and colours. This project demonstrates how I combine stock images to construct a landscape, outlining some simple but extremely useful techniques that will help you in your own compositions.