TUTORIAL

SORRY, I Copied FROM ANOTHER BLOG
In this tutorial, I used this photo:

Open that photo then press Ctrl+B to open Color Balance, set properties like this:

You will get:

Create a new layer and set Blend mode: Screen

Brush some colors in the picture, in this tutorial I used color blue, green, pink, red and set opacity 76%

Create a new layer, choose the brush like this:



Put that brush several times in the picture

 

 

You will get: