Basically, you shouldn't have to do much postwork at all with VSS.  Which version of Poser are you using, btw.  Image 3 looks like it needs gamma correction.  Try using VSSPR3.  Gamma correction is built right in if you are using Poser 7.  In PoserPro, the gamma correction settings in prop should be set to 1 and GC set to 2.2 in the render settings.