on the apps you will find a bar or tool for color and one for opacity, you can adjust the intensity of the colors by increasing or decreasing those, and if you use the pen tool the color will be more intense than if you use the airbrush tool, on chipipaint the are 2 tools called blender and smudge that can help blend colors as for hair take a look at what other artists have done on the intermittent and advanced boards and for some you can play back the video to see how they did it, there is another tool called smooth and this helps smooth out the lines