One of my favorite techniques to create a unique look is to hand color photographs. What I do is start with a B&W photo such as this.
Then I add solid color layers. I set the blending mode to color and then simply paint the mask to show the color where I want it. I use a separate color layer for each element allowing me to change the color of each as needed. I will also adjust the opacity to fine tune the color.
The end result is something like this:
To save time I will invert the masks to black first before I paint in the color. I find a soft edge brush works best. It can be very time consuming as you work on small details. This example wasn’t too bad. The eyes and lips were a bit tougher, but nothing I wasn’t used to doing.
Typically it takes a few hours to create this look, but I find it to be worth the effort.