Shimmer shadow is far less fetching when it collects under your eyes. To get it to stay in place, apply the sparkly stuff only with fingertips, never a brush. While a brush flicks pigment all over the place, the oil from your fingers helps pigments stay on your skin.
As for which shimmer to use: For goofproof glam, choose two complementary shadow shades. Use the lighter tone all over and the darker one in the creases, then add lots of mascara for contrast.
Check out more easy eye makeup ideas.