Slimy skin....

[Elmst]

I would stay away from filters. It's all about the edges! Look at all the references you have above, the highlights have strong sharp edges, if you need more reference look up latex pants. One other thing that will help is loose some of the detail/texture in the skin, strategically place the texture on the focal points of the painting, you do not need all that texture on the lower part of the neck.

I look forward to seeing the finished piece!