Trichomes:
Clear = Not ready
Milky = high in THC (Most people harvest when seeing a high number of milky)
Amber = More of a 'couch lock' feel to the weed.
I personally like 10-20% amber when I harvest, but everyone will have their own preference.
It's a little hard to see from those pictures but they look mostly milky with a few amber, if so you could begin your harvest.