Colorizing PARTS of Images
First, know how to Cut and Colorize images.
1. First you open the image you want to colorize a PART OF, I'm using This.
2. Using the Freehand Tool select around the parts you want colorized, like so.

3. Now press Shift+L and play around until you get the color you want.
4. Press CTRL+D to deselect and your done!
Here is mine, I got a bit carried away! =)

If you have problems, Contact Me