Experts equate choosing a nude nail polish with choosing a shade of blush or lipstick – you should have a basic understanding of your skin's undertones. Looking at your visible veins can confirm it if you're not sure. If you have blueish veins, you have cool undertones, and if they appear green, you likely have olive or warm undertones. But your nude nail polish doesn’t have to match your skin’s shade perfectly. A little bit of contrast is appealing to the eye. It’s important to play around with multiple shades and different layers of polish coats to find the best fit for you. You can always go to the salon and ask for advice if you don’t do your own nails often – they’ve seen it all and have every shade you can imagine. They can guide you in the right direction.