OK. I am unable to reproduce what you're getting at 500/60 or even 500/95. I guess I have to try 2024/95. But first I'm going to make all the other stuff the same as you. I was testing with shader GC.

Your lashes appear less dense than my render because

a) you're using render GC
b) render GC includes (by default) anti-gamma correction of any incoming texture unless you tell it otherwise (nothing to do with a GC network - it's built into the renderer)
c) you didn't tell it otherwise

Because Poser Pro render GC is anti-GC'ing your texture, it makes dark things darker, thus the somewhat transparent areas become close to completely transparent.

There's nothing wrong with that - it's just another factor to keep in mind. In fact, it's a factor that should have helped avoid what you're seeing. I was going to tell you that the lash map is very dense. Near the base it's almost completely opaque. But regardless, you should't get the occlusion shadow you're seeing.

But until I can reproduce it, I'm clueless as to why you're getting it.

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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)