Never have used a pistol much, but from pictures of folks who know what they’re doing both eyes are open and the weapon is about nose level as though pointing at something. My ex-wife was a good shot, learned to shoot with bow and arrow and then pistol and rifle...her half-brothers were half Native American and spent time on an Oklahoma Reservation with Grandparents during vacations from school. What caught my attention, however, was Deb always kept both eyes open. When I questioned her about it she explained she couldn’t wink or close only one eye. She is Irish on both sides, so not much surprised me, but that did.