I am gonna use a picture I have taken myself, you may try the tutorial on it, but you may not use it elsewhere. Below you will see how the picture was before and after.

How to make it:

1. First open your picture in Photoshop.

2. Now duplicate the base layer 3 times, so you will have a total of four layers of your picture.

3. Click the second duplicated layer and go Image > Adjustments > Gradient map. A new window will then pop-up looking like the image below.

Click the long gradient line, and another window will pop-up. There choose the orange and violet gradient one. After that just click ok on that window, and the one behind.

You now have to set that layer to Screen.

Your result will now be looking like this:

4. You have now done one part. Next, go to the third duplicated layer. Click Image > Adjustments > Photo Filter, on the dropdown menu choose Cooling filter (80) and below on Density set it to 70%. Basically, do as on the image below.

Set the layer to Luminosity.

5. At last, choose the fourth duplicated layer. Set it to Pin Light. You are now starting to get at the end. Rightclick the layer and choose Blending options. A new window has opened where you choose Gradient overlay. Set the settings like on the image below, and you will be done. (Click for full view)

Your final result will be looking like this: