Creating a Rock with photogrammetry based ZBrush alpha

Another video tutorial I made. That one covers optional workflow to create photorealistic looking lowpoly rock.
The main idea behind that tutorial was to show another way photogrammetry can be used and how it can speed up work without quality loss. I am showing how I built the highpoly model in Zbrush using photogrammetry based alpha mask, did manual retopology with Topology brush, UVmapping with UVMaster and built fast random texture using 'Smart Materials' in Substance Painter.
This is not the best looking rock and it wasn't my intention to create one in here. Hope you enjoy it :) will make another one as soon as I will compose another background song :)