Does the head morph have a dial? Being able to use it at less than full strength (and mix it with other morphs) would be great.

DAZ and Renderosity products all allow commercial use. That's what we customers are paying for. Some freebies do not, but a lot of people won't download freebies that don't allow commercial use, just because it's a headache to keep track of what can be used and what can't.

Maybe you're confusing commercial use with merchant resources? As I understand it, commercial use means you can render it and sell the image or animation. It doesn't mean you can use the mesh or texture in your own product, and sell that. Merchant resources, you are allowed to do that, sometimes with certain restrictions. La Femme's default texture is a merchant resource. You're allowed to use it as a base to make your own texture for sale.

But then I am not sure if not any figure derived from a Poser base figure is restricted in copyright?

You're not allowed to distribute the mesh (OBJ). Typically, what people do is make morphs and textures for the figures, that customers inject into the figure they already own.

If for some reason you have to distribute the OBJ - you've changed the rigging or something - it has to be RTEncoded. So only people who already own the original figure can install the modified one. This is a pain, and should be avoided unless it's necessary.

If your character is just a morphed version of La Femme, she should be able to take any existing La Femme textures, and wear existing La Femme clothing (using Copy Morphs From). I don't think you need contributors.