Too much of anything is overwhelming. This includes your blush. Follow these tips (along with our blending advice) to make your blush look as flattering as possible:
If you want the flushed look, smile and apply the blush to the apples of your cheeks. If you want a more structured look, follow your cheekbones and then blend the blush upward to avoid creating stripes. The thing with blush is that you can always add more. But if you've been a little overzealous in the application, try adding a little loose powder over the cheek to tone it down. Or gently wipe it away with a tissue. If it's a cream blush, try gently removing the excess with a clean makeup sponge.