This one doesn't look quite ready, imho... but here's the thing - it's all in what YOU want out of the smoke... if you harvest when the trichs are milky (they're still pretty clear), you'll get a more cerebral high... if you wait until there are about 20-30% amber trichs, you get a high that's well-balanced between cerebral and body ... and if you wait for mostly amber trichs, you first of all lose a lot of THC and secondly will get couch lock .... so it all depends on your preferences...
Good luck!