Nice progress. Here's personally what I would adjust (sorry to use the Elstree mask but it was the first image I came across that had a similar angle)...nail marks on the cheeks, noseslots expanded/widened to Vader's right, right side of U-shaped part of nose more shallow angle, sand down right cheek a bit from corner of eye to front of cheek as I think Nohumorman mentioned, and trim the front of the neck to make it a bit more rounded up front...just a bit...
