Yep, mesh lights can be very noisy at times.  In Poser 12, you can apply denoising after the render to sharpen the image.  But that has its downside if it aggressively smooths out the details.  I see that her teeth are a little too bright for the scene.  Try this teeth shader I created, you can control the color tint at the hsv2 node and the specular brightness on the Roughness channel of the GlossyBsdf.  Let me know what you think of it.