When you shoot on a bright sunny day, don't make your subjects face the sun. They'll squint. And weird shadows might form on their faces. You should face the sun instead. Yes, their faces will be darker, but turn on your flash to light them up a bit--it can be tricky though if your flash is not strong enough--if so, try moving closer and see if that helps. However, the best is if you can find shade (then move to the shade), or wait till evening when the light is nicer.