There is such a thing called "over-blending," which ends up muddying up your entire eyeshadow look. Avoid this by taking a moment in between blending to check how the shades are coming together. And of course, be sure to use clean brushes, since using a brush with pigment leftover will most likely not give you the color and gradient you desire. To quickly clean your brush, wipe it off on a paper towel or a cleaning sponge.
No one's perfect. You'll most likely end up having a few "oops" and "oh, no!" moments when doing your eyeshadow. To touch up any mistakes the outer corners of your eyes, you can buff them away with a damp sponge. You can also tone down your shadow by using a clean fluffy brush dipped in translucent powder on the top edge. Many people also swear on micellar water makeup wipes or a Q-tip dipped in eye makeup remover.
