Now mix up a wash (not an ink wash) more akin to the original ground/base colour. Then apply liberally, you may even enjoy this bit :o) Leave to dry and check the results. Maybe the hoss needs another coat of the wash? If so, apply liberally once more. The following pics are examples of the horses thus far. I'll be applying another wash.
Basically, keep repeating the drybrush then wash process until you have something that you are satisfied with. The important thing at this stage is to avoid being too fiddley. Keep it simple.