So I'm new to Carrara but with the Poser scaling being as small as it is. Have you tried to increase the figures size. Maybe getting the figure to a normal scale might cure some problems. It is know that close up renders in poser are crisper and more detailed if you increase the scale to 1000%. I'm not saying that you need to increase that much in Carrara, Because I don't know what the scaling difference is from Poser to Carrara.