I've never really been one for painting much, the vast majority of my work is pencils and paper and from my imagination, but, I want to break this rut and push into digital painting and painting in general. I'm going to try and do a bunch of studies and post them here for your critiques so I can improve.
I will be working mainly with procreate on an iPad Pro.
from comparing this one to the ref I can see that his right eye (our left) the bridge ends too high up his face, should be connecting back with the cheek roughly where the nose also intersects. His other eye is too large and too low down, should be tilted a bit differently as well. His neck is too thin and at the wrong angle, his brows are both too high, his septum attaches too far in, should have a more gradient slope from the philtrum to the tip of his nose. the Tubercle of the lip is incorrect but not by a huge amount. His ear is way too high up!