coloring this whole mess

first i copy the layer with the lines and color the second (top one) in red
then i go on the first layer again and begin coloring the whole fog marking without going over the red lines too much
after i done the whole coloring i go to layer 2 again and color it ina slightly lighter color then the base coat (hind part of the horse)
last i add a little color to the fog and color the muzzle pink and the legs a light yellow color for a little dirty touch
and finished is the fog marking in around 10-20 minutes (based on how messy it is)
i didn't do the finishing touch, but normally i copy the base color layer of the horse and color the places white where the lines don't have white color from the fog (you can see it on the legs, that the lines are still black from the base coat instead of whitish from the marking