The pistils are all white and the bud isn't bulky enough. I start looking at my trichomes when all the pistils start turning color and pulling back into or close to the calyx. So it's not time to even look at trichomes. The reason I try to limit getting close to trichomes is they come off the plant on your hands/camera/loupe etc..
You need a loupe or something in the neighborhood of 30 to 100 magnification. You can get a Carson Cooper Handheld microscope for about 10 bucks at most Radio Shacks. So you can see them close enough to tell for sure. I have some trichome images in my grow journal if you'd like to see them.
Essentially trichomes start out clear, go to milky and finally amber. So if they have all turned milky on you you are close to harvest but from that photo your trichomes look they are mostly clear no cloudy. Anyway you are still early - mid flower.