Gradient Maps in Photoshop
First I choose the picture I want to color, I chose a picture of Kristen Bell
I now open my gradient editor, Pick the gradient I want, I used one from Shadow of the Day
Click ok and then set the gradient to the blending mode you would like! I used hard light for this one
Now, I add another gradient, again from Shadow of the day, Set it to soft light and get a look like this

Multiple Gradients
Now, I click the gradient tool, chose a gradient, again from Shadow of the Day, and drag it over my canvasChange the blending mode and you will get something like this

Now you can add gradient maps ontop of the main gradient. I used the 2 gradient maps I used earlyer in the tutorial and get something like this

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