if there are thousands of vargas-style poser renders at 'rosity and all the
other major poser gallery sites, surely one of them will tell ya how to do it (use an old rdna
GI lite set, set the shadows wrong, don't use dynamic hair, don't  use a background,
then in photoshop add a 40% blur layer over the rendered image. no need to overexpose
the image in photoshop, as a GI lite set in poser can do that very nicely).

hence this would require going thru the gallery here until ya found a vargas-style poser
render.  it would take time, but I reckon they'd be happy to tell ya how they did it.