Really good but you need to adjust some areas of the face like the nose and ear if you are going from the 3/4 concept art above. The nose is too bulbous at the tip. The concept art is more straight down angular. Your cheeks are too round as well hit it will some of the trim dynamic brush to help flatten some of the face out it will read better against the concept art. The ear is sticking to far out of the silhouette of the head in compared to the concept art.
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Thx theStoff
starting to explore mask ideas