When I used to do it I took CCC's. It's corricidin cough and cold, the purple box. It had 30mg of dxm as well as other shit and I used to do the whole box of 16 and be pretty out of my mind. Good times.
Lol. It could be because of where you took the pictures at on the plant but the first picture looks more mature. You want to wait until the trichs get a fat bulbous head on them and start turning amber. It's really a matter of preference. If you harvest a little earlier you get less cannabinoids...
From the bud pics I think it looks ready but the trichs look way more cloudy than amber and it looks sativa so I would recommend wait a couple days to a week before harvest. Almost there!
I can't tell from the picture but if it's just the little skinny green leaf no that's not a preflower. If it's little white hairs behind that, then yes they are all females.