Hard edge sketching in zb

I've been doing a bit more to the Rhino model I started a little while back. All in Zbrush and sculpted from a sphere using dynamesh. Getting volumes and major shapes sorted before Zremeshing and detailing him.

Orc bust sketch

I'd not done anything Orc related for the best part of a decade. So I thought an Orc bust would make a nice Zbrush sketch to do on the train.
Still want to add more skin detail, veins etc. Maybe add a helmet or even a body. Will it actually be an Ork?