that's looking much better, maybe if you can get some of the particles closer to the camera and then using your DOF to blur them out.

It still doesnt quite look like it's "sitting" in the scene. Are you using a compositing package or doing it all in maya? what I would suggest (which i learned today) is to use an edge detect to find the edges of the feteus and then blur them ever so slightly and that will make the object sit a bit better.

Alan