Usually, people have very small eyes may looks closed eyes when they smile. In fact, almost all of people can keep eyes open when they smile. I don't know why you ask such a ...idiot question. Just keep eyes open as you want when you smile. If you have really small eyes that make you look like closed eyes, you can wear eye makeup that to make your eyes look bigger so that your eyes can keep "open" when you smile. Don't worry, Keep calm, open your eyes and smile. I believe you can do it.