It's all about trichome color. Get a scope and scope them. If you are gonna be growing the same plants a while, I recommend taking an early sample, most of the harvest when you feel it is the best time, then leave a tiny bit to mature a little more. That way you can compare and see exactly which high you like best from that plant. I'm not sure I agree with the last pic though, 50/50 is kind of a big swing tbh, I try not to let them get past about 80/20 with the 20 being amber, the 80 being clouded.