Open a new layer, using the "Brush" tool and "Eraser" tool, the skin color being colored and then layer filter is change to Multiply to blend with the background Image.
More layer of colors is added using same method to provide the depth of shadow similar to how manga usual drawn.
Experimenting the effect of the skin color when the color saturation is reduced and the overall look of the people looks more pale and ill.
The Eyes, Lips and Hair is colored accordingly using the same method as mentioned earlier
Using the "Marquee" tool, copy the reference Image into the image to be colored, then using "Eye Dropper" tool to extract the color then mark in on the layer using "Brush" tool.
Using the "Quick Selection" tool, choose then area that is going to be masked and then using "Refine Edge Brush Tool" to brush over the edges. After that, select the output to be "Layer Mask"
Create "New Solid Layer", using color picker to choose the color.
Move the "Layer Mask" to the Solid layer to color the hair.
Repeat the previous steps on other parts of the image for example the Eye, Lips, Skin, Clothes and such.
Choose a Black and White Image to be recolor
Color the skin of the subject using the Masking method, then use "Brush" tool to show the Highlight and Shadow on the Skin.
Using the Masking Method Create 2 Layer of blue color and overlay them to produce the jeans cloth effect.
Using the "Brush" and "Eraser" tool, color the Lips and Eye of the subject.
Using the Masking Method, Include the color of the hair and also the color of the shadow of the hair.
Adjust the brightness of the Image to a brighter tone to make the Image look more natural