Since they are fairly large water decals, I found the best way to get them to lie flat against the nail is to apply them where you want and then press the entire nail into the palm of your other hand so the decals warms up and relaxes on the nail.
You can even cut off or paint over certain rings to get a different look:
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**This product sent to me by KKCenterHK. This is my honest, unbiased review.