In this tutorial...I will show you how to Colourize Images
So first, pick an image.
I have chosen this one:

Zoom into the place on your picture that you want to change the colour of.
I have chosen the lips.
Now on the Toolbar on the Left Side, select the Magic Wand.
Change it to "Freehand Selection"
Now go around what you want to colourize.
Now go up to Adjust >> Hue and Saturation >> Colourize
Now just pick the colour you want your selection to be.
Then press OK, and Zoom out.
Heres mine:

haha, it kinda looks bad cause the pink totally doesn't match...but yours will look great!