Additional coats of nail polish will often produce a deeper, richer finished color. Check the polish label for recommendations. With some nail polish brands, you can apply up to three coats. Always let each layer dry completely before proceeding to the next.
This is usually the time when you'll start to get restless. After all, if you've been doing a thorough, conscientious job, you've been at this manicure thing a while. The only problem with causing a smudge now is that it could be hard if not impossible to smooth away, leaving you with a wonky nail or a major overhaul job. Take it easy, and be patient. Crank up your tabletop fan and think positive thoughts. Your nails are going to look spectacular.