I did the this image for a childrens book publication about a year ago in Raydream (Before I had poser)so I know a little about what your doing. Most of the models I used were altered Raydream models or one's I made myself. The 3 main things you have to worry about is the lighting, lighting and lighting. The small inset picture is the first render while the big picture is roughly how it looked after post production photoshop work (I'm better at photoshop than raydream). I hope this give you some ideas and email me if you have any questions.