Hey B so i notice with my plants i see ambers pop up on my sugar leaves much sooner than my budsites. When the resin glands develop those bulbous tops like in your 1st photo that's a good sign harvest is near. If you're seeing mostly all with round tops and they have a milky color you're good to harvest any time now. It's really just preference. Ed Rosenthal says anything past bulbous and clear you're losing thc...i don't see it that way because i like a little thc degradation from the milky/ambers it gives a little less risk of panicky weed.
Another good sign to watch for is the pistils swelling and then discoloring and curling in, i think if you have like 60% changing along with the trichrome change you're ready to chop. Have fun with the trimming โ๏ธ