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Almost every makeup tutorial comes with a little nugget of advice that you can tack onto your routine and claims to make a world of difference. Want eyes as big as Zooey Deschanel's? Line your waterline with a nude eyeliner! But is the difference between normal eyes and gorgeous doe-like eyes really as simple as a few swipes? Is it a placebo effect? Or are your eyes just watery and full of liner?We gathered up a bunch of those little makeup tricks to get to the bottom of it all. The twist? We're not telling you which is which. Click through each side-by-side comparison to see just how big (or little) of a change they make. Can you spot the difference?