4. You can either create a new layer or personally I just like to stay on the same layer. If you are afraid you might ruin something than I'd create a new one. However I like having all of my fur on just one layer. Using a variety of fur brushes I will start filling in the hair.
For now I'm just using that one brush that we made earlier to start off with and a darker colored brown. Follow the path of your base colors.
And you should have something like this.
5. Once again, on the same layer I begin adding some highlighting; notice I'm not fully coloring over the other hair I just made
6. Then I come back with some shading once more by using a darker color. I like to periodically use different sets of fur brushes. Notice how if you continue to use the same one everything looks the same. Not all hair is identical. There are short fat hairs, thick hairs, and light fluffy hairs and for the sake of realism switching to different sized and shaped brushes will help. And once again I'm using the dark color to separate my fur clumps. If you color it right the fur should already be partially separated/clumped so all you have to do is find those separations and fill it in with darker fur colors.
7. Still separating and fixing hair clumps while also adding in some individual pieces of hair. Not all hair flows in one direction so I add some individual pieces of hair to stand in different directions.
8. Continue repeating those steps until you are satisfied and when you zoom out you should have some mighty impressive fur.