I agree, it has a bit to go. Over half the hairs are still white. And like someone said teh trichomes look small, although each strain has unique sized trichs, so that may be as large as they get. This is a good situation to not listen to only the trichomes. Also, I would take shots all over the plant, sometimes you get pre mature trich changing, the oldest ones will change first. It looked like that was a bud shot, but i know many of my plants leaves would have their trichs change before the ones on the bud. Keep an eye on it it should be soon