I'm Creating faces from photos and im getting a thin black oval over
each eye (roughly where eyelashes might be). They look awful.

Can someone tell me how to avoid them. Thanks

Those lines are the shadowing of the eyelash edges of the FaceGen
default mesh.

If you don't like them, you can minimize them by increasing ambient
light and reducing light from point sources, or by switching to a mesh
that doesn't have that kind of eyelid geometry such as the 1000 poly
mesh or the internal model set (additional model sets available only
with paid version).

Best wishes,