Jump into the scene, Lara!

Step 7

[Step 8]

[Finished Artwork]

7. Merge to form giant robot!

Now we're gonna put one and one together, "one" being Lara and the other "one" being the mountainous background from Step 6. Make sure both are up in Photoshop (and check my warning notice about RAM in the previous Step).
Now, go to your character's Channel window and select the channel that had everything behind her (remember I told you to make this in Step 3?). Marching ants should appear all around her.
Click <ctrl>-<shift>-i all together. What this does is invert the selection so instead of the background, the character herself is selected. Now click on the Move tool.
Click on the selected character with the Move tool without releasing the mouse button, and drag her onto the image that you want for your background and let go of the mouse button. She will now be part of the scene.
Go to Window --> Show Layers and the Layers window will appear. You can see the character and the background are both there, just like the Channel windows. The character should be active, so you can use the Move tool to move her around to wherever looks appropriate. If you want to rotate or flip her, go to Layer --> Transform and maneuver her to your desires.
Do you want to add shadows to the background for your character? In the Layers window, click on the background and only it can be affected. Then use the Airbrush tool and the color black (and a very weak opacity level) and start tossing in shadows : be careful that they match the same direction of light you placed on your character in Step 5!
When done with that and you're happy with everything's placement, go to Layers --> Flatten Image and the whole image will become a single picture with no layers.
Now use the Airbrush and the color white to add extra highlights to whatever you want (preferably shiny metal, but whatever you like).
You're almost to the finishing line! SAVE YOUR FILE!!!

Lara has been integrated into the scene with
her chosen background.