Definitely some good advice from BAM. I'll add to it and say that in addition to holding the figure at arms length, it can also be helpful to look at it under different lighting conditions. You're going to see a lot more contrast with a strong overhead light than you will under more diffuse lighting conditions. So you might think the contrast looks great at the painting station and then, when you take it into the other room, it looks very flat. That's one of the reasons I try to angle my painting lights so they hit the figures closer to straight on rather than from above. Anyway, every so often take the figure into another room and see how it looks. Bathrooms and kitchens seem to work well. This is also a good trick when doing true metallic metals. Those can be very sensitive to the light position so it's really helpful to look at them under different lighting conditions.