Step 6 - Darken Mountains

Go to Image > Adjustments > Brightness/Contrast and put the brightness to the lowest setting, and the contrast to the highest setting.

Step 7 - Duplicate Layer

The quickest way to do this is to type (control/command + J). The new layer will be called mountain copy.

Step 8 - Flip the Mountains upside down

Press (control/command + T). This will allow you to left click (with your mouse) and select "Flip Vertical". The following images are a before and after.

Step 9 - Move the Mountains to the bottom

If you are still in the control/command + T view, then you will be able to click and drag the flipped mountains to the bottom of the document, and they should snap when you get it to the right spot. Click enter to exit this mode when you're done moving it.

Step 10 - Create a Mask

In your layers menu, select the 3rd button to the right (the white circle inside a gray rectangle icon) to create a mask, and using your gradient tool, create a black to transparent gradient from the bottom of the document to about 600px (the midline where the two mountain halves mirror each other.)

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Step 12 - Checkpoint

If you've done your mask correctly, you will have arrived at something like this.

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Step 13 - Add some Blue

Create a new Layer (Layer > New > Layer). Select the bottom of the document. A good way to do this is quickly and accurately is to select the "mountain copy" layer because you know that it is half of the screen. To do this, go into your layers palette, select the layer "mountain copy" (control/command + click on the icon for the layer "mountain copy").
Note: If you cannot seem to select the layer by clicking on it, you are probably clicking the wrong thing. To the left of the layer name, there is a small icon of the layer. You should control/command + click on that image, not the text itself.
Select a blue for your foreground (I choose #216a82) and black for your background, and create a gradient. Set the opacity for this layer to 50%.

Step 14 - Lens Flare

Create another new layer (Layer > New > Layer), and call it "lens flare". Fill this layer with black using the fill tool (G), and then head up to Filters > Render > Lens Flare. Select 105mm Prime, and leave the brightness at 100%. Then center the lens flare as best you can (if you miss the center you can always undo and try again, or just move it using the move (V) tool)0.