The most taxing challenge so far 😀 I had never tried. It was my first attempt at quicksketch, and I can ensure it really is as stressful as it seems! I burned out until the end, so I am glad the next phase will be on figure.
The above was a one hour quicksketch (one hour is still a fairly short time for a portrait). Follow two twenty minutes:
And lastly eight (!) 5 minutes (!). These were by far the most challenging, I can barely find proportions in 5 minutes!