I find that if you render in poser using as large as you can get your machine to spit out you have the ability to zoom in and attend to some of the details. Also use poser to get your lighting and shadows arranged. You can soften and smooth the lighting even change it some in photoshop after wards. Also I try to see what I can do in the post render about a final lighting to bring everything together or use a layer that adds some grain which brings the whole of the post image together. The layers have to be experimented with to give you what you feel is right for your image. Hope this helps.