Nail polish gives your hands a finished look. And manicures in general add class to what otherwise may be your average looking hands and nails.
I would never go out without my nails polished. They elevate my outfit, convey a sense of style, and display my sense of aesthetics and femininity.
One of the first things people look at (so they say) after my face and outfit are my nails.Source: http://myfolio.com/art/08nz1c4bsy