Synthesis is a more complex work, can be divided into three processes: first of all, this step is very important, if not sure, you can refer to a number of excellent effect map to find inspiration. Then is to collect material, and according to their own ideas to arrange and mix material. Finally, the late adjustment, rendering, color matching and landscaping.
The final effect of the Photoshop tutorial
1, create a suitable background. Using your imagination, don't just use fixed material as your final background. Click the background layer, and then command CTRL + J to copy it.
The next step is to flip the background, edit > Transform > Level Flip, and then merge them together, you have a lot of methods here, I don't repeat them more.
2, now select the two layers, and then press CTRL + E to merge them into the layers. Now the picture looks strange, just like in a mirror. We change it by using a brush and a clone stamp to make it look natural.
Select the Clone Stamp tool (S) and start cloning trees and grasslands until they appear to blend naturally, then use the Brush tool (B) to smear the roots of the trees with a black brush. So that the woods do not look symmetrical.