Where to Apply Blush: Compare Two Placements on Your Own Cheeks
Try a little blush on the round part of one cheek. On the other side, start higher and farther out along the cheekbone. Using one shade on both sides lets you see where the color draws your eye.
Left: blush centered on the apples. Right: blush swept higher and outward.
Find the apple of one cheek
Smile gently to locate the part of your cheek that rounds forward, then relax your face. Set a small touch of blush on that spot and soften its edges in short circles. Leave enough color in the middle to see the starting point when you look straight ahead.
On the other side, follow the cheekbone
Use a clean fingertip to find the bony ridge below the outer corner of your eye. Start the blush on the cheek there and blend the outer edge toward your temple. Use the same light load you used on the first side so that a heavier application does not decide the result.
Compare from the front and at an angle
Step back from the mirror and relax your mouth. Which patch catches your eye from the front? Turn your head a little and look at how the other patch follows the cheekbone. If one cheek simply looks darker, tap it with a clean sponge before comparing again.
Make the placement easy to repeat
Remember where the brush first touched down and which way the last stroke went. Try that movement on both cheeks next time. If you are still undecided, swap sides another day to see whether lighting or the placement explains your preference.
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Source · Marie Claire · How to Apply Blush, According to Makeup Artists