tru, although its very hard to tell from a picture because lighting, flash, etc can change everything, but they look pretty cloudy to me. Id give em a day or 2 more and go for it if your not going to get a microscope.

far as where to look, you want the majority of the top colas to be good. Obviously some of the lower buds wont be at their "full potential" but this is the sacrifice you sometimes have to make in order to guarantee your big stuff is prime. When I see about 25% amber on most of the direct light buds, is what I like.

PS. Growing is an amazing learning experience, always do experiments. You have 3 plants right? Well harvest 2 of first and let the other one go a few more days longer. When its all dried and cured, if there is a large difference, then you know to wait longer (atleast with that particular strain but in general too).