Ref and ref source.
I’ve noticed that a lot of the artists whose styles have the most impact on me – Keiran Yanner, Massimo Carnevale, even going back to Drew Struzan and far back to Leyendecker – have a strong sense of sharp edges and facial planes. My own work lacks that sharpness, and so I’m trying to get a better sense of lines and planes in my work. Here’s one study in that direction – one hour, the length of a Ninja Mountain episode.