When can I harvest?

I have read in many places the key is to find the sweet spot between clear and cloudy trichs my only problem is my trichs are all staying clear it seems but the plant is obviously exhausted and appears ready. Would anyone please be willing to give some helpful tips on my first grow and advice if you notice something im doing wrong. Any help would be greatly appreciated. Pics are attached.

AK-47
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Thanks!

Wow, if those pics were right side up, I'd say they look great, but I think you may be getting impatient, thinking they are 'exhausted'.
How long have you been seeing them 'staying clear'?
The last couple weeks before harvest always seem to take the longest, but also will surprise you with the weight they will add, even if you are not seeing an increase in size.

I think the "sweet spot" is between cloudy and amber. Harvesting with clear trichomes is too early imo, they've still, as imchucky says, got a load of fattening up to do...