Step 8: Change The Blend Mode Of The Solid Color Fill Layer To Multiply

Her hair is now orange, but there's a problem. The orange is covering all of the black areas that were in her hair. To fix that, with the orange fill color layer selected, go up to the layer blend mode options at the top of the Layers palette, click on the down-pointing arrow to the right of the word "Normal", and change the blend mode for the orange fill color layer to Multiply:

Now the black areas in her hair are visible once again:

Step 9: Continue Adding Solid Color Fill Layers For Each Section

Repeat steps 7 and 8, adding solid color fill layers for each section, remembering each time to select that Use Previous Layer To Create Clipping Mask option in the New Layer dialog box so that your fill color affects only that specific selection and not the entire image. Again, feel free to pick any colors you want for each section since you can always change them. When you're done, you should have a solid color fill layer above each section's layer in the Layers palette, and your image will be completely colorized.

Remember that layers higher up in the Layers palette can block lower layers from view, so you may have to click and drag some layers above others in order to colorize them if some sections in your image are overlapping.

Here's my image after adding a solid color fill layer to each section and changing the blend mode of each one to "Multiply":

The pop art effect is now complete, and the nice thing is, I can now go back and change any colors I want, as we'll see next.