Before Poser 7, you must pay attention to the render setting Max Texture Size. Poser has this to let you try to keep it from blowing up using all your memory for textures. The default is 1024 (I think). The result is that your beautiful 4K texture is reduced to 1K before using it, leaving you with 16 times less detail.

Try raising the max texture size to 4096, and reload textures, then render.

Also, your render setting Min Shading Rate will give you grief as well. You must let Poser examine your shaders more closely. Use .2 and render again. You'll be surprised.

But, be prepared for more time and more space getting used up.

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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)