- I would say this is just a fleabitten plain and simple, no need to add the 'chestnut base' thing.
- The mane/tail coloration works pretty well.
- Eye color choice is perfect.
- Very little dimension in the colors. Generally the fleabitten markings stay in the center of the horse, then fade out to white around the legs and muzzle, and then fade out to grey around the lips/eyes/hooves/ect.
See here.
Either way, your effort is good, but not quite suitable for the adopt. Thanks for trying out hun!