mix a lil paint with a larger amount of water and place drops on your nails, let edge dry, then with a dry brush or a q-tip place it in the center of the water to absorb the excess amount and you should be left with a bubble like effect!
The Bubble Nail/Hump Nail Trend is Breaking the Internet Right Now
TBD Avoiding Nail Polish Bubbles (Note: Tip should say that you can add a few drops of nail polish THINNER to your bottle. Never add nail polish REMOVER. It will ruin your bottle of polish for the next time you go to use it.