We manipulate where we want to the light to go in 3d softwares, no matter what it is... ambient or parallel or spot, it's not just basic lights
once you see how light and things move, and you'll understand more about it, if your the one who's really the one manipulating the light..
when you want some guy to just go and copy photo reference, what does he get at the end of the day? a finished copy of some photo,
and nothing else and maybe he would think he's improving but really he's not, he might stick to copying photo reference for the rest of his life.