Quote - P8 still has a problem with blotch artifacts, which can appear in places where you have geometry close to other geometry (like your eyelash problem). 

Paul,

Funny - I was just speaking to SM about that. They're working on it. Meanwhile, Larry Weinberg said that it's related to Firefly now being a hybrid REYES renderer (micro-polys) and a traditional ray-tracer (for IDL, etc.) Internally they disagree about exact positions sometimes. He said that if you render the whole scene through a Refract node (like I do with the "Artistic Lens") then Firefly becomes a pure ray-tracer and there will be no artifacts. I haven't tried it yet. If you're curious, give it a go. Set up a one-sided square in front of the camera, and only a Refract node with IOR = 1 plugged into Alt Diffuse. Turn off DV and SV, of course.

Note: You'll lose displacement because of this, but that isn't always important.

BTW: I was looking on your site and your demo renders for your freebies are amazing.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)