Hash plant not even close with all the clear trichomes. Barbara is showing a bit of amber but so much clear I would wait. The amber appears to be on the sugar leaves which always go first.
Couple of things. First is why are you flushing, considering the buds do not use the nutrients? They take the starches and sugars manufactured by the rest of the plant. Second is don't bother guessing when it's time to harvest, particularly since you can get such nice close-ups of the trichomes! How much amber do you want? Which is to say, how much CBN do you want, as that's what you're seeing when the trichomes go to amber...THC converting to CBN.
That doesn't mean they know why! Have a good reason to flush if you must. Many here see no reason to starve your plant at the very time it's trying to make the frostiest buds it can, including Pennywise, 2017 Member of the Year!