It's the sunshine! After all, kids who spend a lot of time on beaches get blonded, right? So perhaps courier pilots, spending so much time flipping through the jump, also get blonded by the Light?

The dark eyes are most likely contacts -- again, protection from the Light encountered in Jump. Also cool, almost like sunglasses :-)

Blonded by the Light? I'm going to be humming that for a while now . . . who sang that, anyway?