Basically what you see here in the three colors is how to adjust your brushes for coloring in Photoshop. Let's take a look at the first brush using the color blue. This is the airbrush. If go to Window->Show Options you'll see as I have shown in my screenshot how I was able to accomplish different effects. The left column, I used a Solid circle as the brush nozzle and the one on the right uses a fuzzy cirle. 
Tip: To load brushes go to the arrow on the top right of the pallete menu and load brushes. They should be in your Adobe/Photoshop directory. 

If you notice below those first two you'll see that the brushes fade. This is done by the options for the brush, I checked fade and said how many steps till it totally fades out. 

The red is pencil and the green is paintbrush. For the last rows of the red pencil I used the auto erase option and for the green paintbrush I used the wet edges function. 

I took screenshots of the palletes and toolboxes to better illustrate.