Dark periods is anecdotal and has not been proven in any way shape or form.
What you can do to increase oils, cannabinoids and terpenes concentrations by up to 50%, is giving her a controlled drought period during flower.
You can also use Uv-B during flower to increase these concentrations even further.
https://journals.ashs.org/hortsci/view/journals/hortsci/54/5/article-p964.xml
(this has been published by "american society for horticultural science")
Based on the pictures i can't give you a harvest estimate because i can't get a clear view of the trichomes, but if you take a photo closer to the bud still in focus, i might be able to, just shoot me a dm if you want to add another picture to your diary and i will take a look and answer by dm. But from far away looks ready for my taste. Just like the Harbinger of harvests said, some like it before its covered in amber, im one of em, covered with white sugar is top shelf to me, brown sugar not so much, but everyone has different tastes, and different brain chemistries. Usually and this is almost guaranteed, harvesting at this point is more of a active high, harvesting later is more of a sedative high. The strain determines what do the specific cannabinoid profile targets, either more the cb1 or the cb2 receptors and their affinity at these receptors determine whether you feel it more in the body or in the mind, but the state of the thc is what determines if its active or sedative, you can have a active body high, or a sedative mind high, and vice versa. I tend to go with active, don't like to sit around all day.
Now when it comes to harvest, you want to leave your buds on your stem for as long as possible, the stem being attached to the flower during the whole drying proccess will SIGNIFICANTLY improve taste.
Keep in the dark, cold temperatures and good ventilation and your bud will be fresher than the prince of bel air.
Now, if you want to go by anecdotal, i have this juju i can make for you, the entities will make your flower the best flower you have smoked in your life. You may not understand how this process works, but it does, everyone practicing Umbandismo can confirm, so there's not even a question about it. Just pick my answer and i will make it happen my guy, you still have to follow the indications above however, you also have to put in the work for the spell to work.
Stay lit growmie, and have a nice smoke later on.