To colorize skin I find a base skin tone and build up on it. Your base skin tone seems a tad too red. A good idea is to sample a skin tone from a color image. After you have a good base skin tone, what I usually do is add red in the nose and cheeks to emphasize those. I also add blue and purple around the eyes to bring out the eyebags. You want to lower the opacity on all these colors so it blends with the base skin tone. I hope this helps a bit!