Certain colours can look nice, length doesn't really matter to me unless they're too long. But it honestly doesn't matter to me. If you like to do it, then do it, but don't go out of your way on my account.
I don't really like long nails, but I love painted nails. Wether or not a color looks extra pretty really depends on a lot of things, with the most important thing being the other clothes you're wearing.