One of the things that might work: use the Grouping Tool, create a new group, Add All, and then reverse the normals. Then nake sure you set the display settings to Hidden Line or Smooth Lined. Create another new group, and now select all visible polygons (they were the backfacing polygons originally) just by dragging a rectangle around the prop. Reverse normals. Select the first group, containing all polygons, and reverse normals again. You might have to do this several times with several different views of the head, but it's the fastest way I know of to fix the problem.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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