majority look milky to me, so i would start flushing.. if you're in soil you should flush about 10 days to 2 weeks.. in soilless (coco, peat) about a week is fine..hydro 2 to 3 days..
when you harvest majority of the trichomes should be milky, with some amber (the state after milky.. they start out clear)..
milky trichomes give you more of a head-high, while amber are more a body-high, so the percentage varies from person to person.. i prefer between 5 and 10% amber