Maybe it'd be even better if the brows weren't a single block, but more shaded? He looks less eternally surprised now.At first I thought his sculpt was heavily inspired by the first Ken, but now I can see, that it is more interesting.
I say fill it in and give him some white dots in his eyes to make him look a bit more alive.
I think h's fine either way.Doing the brows as a single stroke keeps the vintage feel, but why not try doing them as little strokes put together for a more realistic look? And Jawn had a good suggestion with the highlight dots.
That shape would be OK and agree with Jawn about adding the light points.