It's just being a creep to ask things like that. It's not "just asking" - if there were nothing more to it, there would be no reason to ask or think someone would mind. But it somehow matters to you, which is fine, just keep it to yourself.

I sometimes I shoot women that look nude. Some indeed are, but some are edited or positioned to look that way. It's no one's business other than those at were there in the time.

You mention 4 point: So that would mean background / key / fill / rim? I don't really see any rim light (which I was expecting to come from the signs). If photographing a scene like this, I would use less fill - it's not really expected at night. Fill becomes the most important in daytime / lighter environments. (Usually I aim for drama and use no fill, so just key + rim -> epii.info/anime/2015/gits-inno… but drama isn't really the goal here.)

Mature Content

 <-- this feels a lot more realistic, with the sign light clearly lighting her. Though as a photographer, I'd still add a rim light - pretend it's the moon or something to provide more separation from the background. I see you added something that adds a little highlight to the arm, but what about the hair? That usually catches rim light the most.

Path tracing is typically easier on GPUs than ray tracing as I understand - until nvidia's recent advancements. So I'd expect to generally get better speed than ray tracing. (Though you may need many hours for something reasonably noise-free.)
I hear Octane is pretty quick, but Lux/Cycles are more the alternatives I had in mind.

Anyways, nice to see GitS.