I found that Sydney does have very fine light brown eyelashes. Preview does not handle the transparency map properly.

But I would first make sure to switch off texture filtering for the eyelash image maps - it would normally be switched on by default. That should give a fair improvement. You could also try increasing pixel samples to reduce aliasing, and reduce your render minimum shading rate - but be prepared for longer render times.

The attached load-and-render (almost) pic is with texture filtering off (I always switch it off for my complete scene before rendering), min shading rate of 0.5 and pixel samples = 6. Are you getting anything like this?

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)