To polish your nails in your dream suggests that you need to put more focus onto what you are doing and what you are trying to accomplish.
Dreaming that your nail polish is chipped means that your strive for perfection will only leave you disappointed. If you dream that you nail polish is smeared, then it indicates that you are rushing into something.
To dream that you are changing your nail polish colour represents your creativeness or emotional nature. To notice someone’s nail polish in your dream highlights their actions. Perhaps this person is doing something suspicious or doing something exceptionally well. If you do not like wearing nail polish and dream that someone is wearing nail polish, then it indicates that you are bothered or annoyed by their actions. This person may be doing something that you disapprove of.
Look up the colour of the nail polish for additional significance. In particular, if you are wearing black nail polish, then it indicates your “don’t care” attitude; you are in control. If you are wearing orange coloured nail polish, then it means that you are feeling inspired; you are ready to create. If you see clear nail polish in your dream, then it signifies your objectiveness in a situation.