Fascinating use of classic technique with contemporary design. Your client must be delighted with it!
One minor point regards the top plane of the forehead which I think could be greyed or cooled, or darkened to help make the turn more into the hairline...
I am partial to clove oil myself... mixed with linseed oil, I apply it to palette from a salad oil sprayer to keep paints fresh between sessions. (Love the smell!) Perhaps this could be used as a glaze? I'd fear yellowing from linseed... My vote would be to try the Winsor-Newton product suggested above...
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