If you are painting the legs white to look like snow. don't paint them like the rest of the model, then add through dry brushing or dabbing white on top of it. If your going for white cloth that is different, one that will be hard to partner color wise IMO. But the best thing you can do is take a piece of paper and paint blocks, big blocks with your main color and smaller blocks size depending on how much you will use the color to see if it works, then paint a test model. Personally, I use metallic for all my weapons except for some special ones. I use what was scorpion green for anything poison.