Can you kill people using photos? Not trying to kill L or any other potential enemy of Light using pictures using Misa's eye is a plothole?

I kind of forgotten if the anime or in the manga (I haven't read the manga), has a scene where they wrote someone's name in the Death Note by means of pictures or photos. And if they did, how could Light never thought about using this tactic?
You can kill people using photo or video. But getting L picture is not that easy. (Pictures taken from chapter 30)



Later Misa met Light and L together and she knew L real name. Light could ask Misa to kill him or ask her his real name but Misa was arrested short after they parted. But even if Light know his real name he didn't want to do that immediately because Light was very cautious about killing L. (Pictures taken from chapter 19)



He was in deep thought about it but he conclude he couldn't kill L without getting suspected by the police. (click to enlarge picture)





Later when he learn that he's the real L. He still didn't want to kill him and just want to take it slow and find out about everything before taking any action.