I agree with Barnacle, looks like your still a month or so out. The pistils are at a very early stage of maturation and if I had to guess, I would accuretly assume the majority of your trich's are still clear. If you can, you should invest in a 30 - 60x scope/magnafying glass / loupe. I purchased one designed for inspecting fraudulent money with a black light and an led with 60x zoom. It works amazing and I can accuretly pin point precise harvest timing by trichome colour.
Hope this helps, cheers.