ZBrush Render plus Photoshop rotational duplication plus Photoshop symmetry painting.
Viewport-Screenshot of the unfinished ZBrush-project from a frontal-diagonal angle if anyone wants to see this. ;-)
Vampires' life cycle
A graphical illustration I made from a ZBrush-head that I modeled and rendered flat for this. I'll finish a photorealistic 3D-portrait-version after upgrading my trustworthy 10 year old Mac Pro. ;-)