I also agree with Relaxed Lester, your plants appear to be in week 4-6 of flower and neither have the pistils withered nor the calyxes swelled yet. You need a 30x jewelers loupe to see the trichomes and judge when to harvest. Most people harvest from 5%-30% amber trichomes. Harvest at 5%-15% amber trichomes for a "head high" energetic effect and harvest at 30%-50% amber trichomes for a "body stone" sedative effect strain dependent.