Your render settings are a bit low, set min shading rate to 0.25 and increase texture size to 2048 at least (depending on the final size you'll be rendering). Increase pixel samples to 5 and check for smooth polygons.

I don't know what version of Poser you are using but you might have to disable texture filtering on every texture of each material too.

As for the bloated look, seems like the settings for the displacement map are set too high, but it would be unusual for the vendor to include wrong settings like that.

Some proper lighting will be needed too, the default poser lights will not do for a good render.