It looks ready based on pistils, but to really tell for sure you'll need to look through a microscope and check the trichomes. Beautiful bud by the way!
Ripeness is subjective. Letting a plant go longer can change the high as well increasing the size and density. That being said if you let a plant go too long then the quality will decrease. I prefer to cut when my trichomes are about 15-20% amber. Some strains will have all orange hairs at this point while other strains still have some white hairs so it's best not to try and judge by a naked eye.
I agree with everyone above. I go longer on amber cuz I like more couch-lock . The pistils look good but I usually have more yellowing in the leaves. Definitely close though. Pretty purple.
Its kind of weird that I have 4 plants from the same source/type of seed and they all kind of look different. This is the only one that looks done, the others look like they need a few weeks to get to this look.
"I prefer to cut when my trichomes are about 15-20% amber."
I realize its subjective but seeing that amber means degradation of THC I am reluctant to let it go that far. If I see any amber at all I take it down. Besides I'm typically on the verge of running out so thats another motivator lol.