For all who works with water scenes, other liquids, glass or gems. I found some helpful information
( Unfortunately the documentation seems to be a bit older - some pictures are missing )
"Working with Refraction Index"
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inside is a link to a "refraction indes list":
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I still need some time for a new picture.
I'm already creating a scene, but always something is missing (hair, poses, the right light ... etc) .
I still need some practice.
... but above all I need more: scenes, furniture, shaders, lights, models, hair, accessories, gestures, facial expressions and poses.