There is actually no reason to work in CYMK, unless you are going to have you pictures printed by an offset printer and are getting into adjusting dot gain and suchlike. You are just making the files 1/3 bigger. If you save your picture out of Poser as a TIF or Photoshop file (or even a JPG, but the others aren't lossy formats) AND open it up in Photoshop AND it looks O.K., BUT it prints green it is a Photoshop problem, not a Poser one. Photoshop is supposed to print it as you see it, that is the whole keystone of digital printing. I used to teach Photoshop, so bear with me here. Remember that little thingee on agjusting the colors that ran the first time you started Photoshop? Photoshop has a lot of ways (like that) that let you do things hopefully right, but often wrong, that will mess up your colors, or gamma factor or printing.