You want to harvest when the plant is starting to look ready. The leaves will usually yellow, not always. The buds swell with water and become top heavy. The triches are cloudy. Amber means degradation. Don't let the buds go that far. A bud with mostly amber triches will be harsh and the high will be unpleasant.The amber trich theory is a myth. Cloudy is good.
Your plants look close but you have to decide. As a general rule plants can be harvested from the top down as buds ripen although many growers harvest all at the same time. I harvest in two stages...Tops first then a week later, roughly speaking, harvest the lower buds.
The best cure thread in my opinion is Simon's thread. It helped me and hundreds of other growers. Flushing hydro grown plants is necessary to leach excess salts. Soil grows don't need flushing. There are other myths as well. 24 dark before harvest is one of them although it hurts nothing its just a waste of time. Bud rot is not curable by and large as most diseases aren't and prevention is the best method. Someone recommended a product for Bud rot, I can't comment on it as I always cut out and trash any rotted parts. I never spray anything on stuff I smoke. Its generally not a good idea.
http://rollitup.org/t/a-perfect-cure-every-time.514841/
