As a technical note about creating morphs for Fibermesh brows in Blender, you'll want your falloff on your brushes to act on volume rather than surface. Blender's brushes act on volume falloff by default. There's the new hair stuff with Blender so you can probably forego Zbrush, I haven't bothered to update Blender to latest so I can't comment on how good it is but judging by tutorial videos I've watched, pretty damn good.