Id say ur garden looks pretty good. I dont have an answer to your curling leaves question but I think u should be ready for harvest very soon. I cant tell for sure by the pics but if u r growing in soil u should flush the medium and then feed them plain water. That way ur plants use up the starches and sugars that r in the plant, giving u a smoother smoke and better burnability. The best indicator of when to harvest is your trichromes, when they turn milky white they r ready but sometimes it can be hard to tell. The pistils changing color from ur whiteish color to a darker orange or brown is also a good indication. According to, Cannabis Cultivation - A Complete Growers Guide, when 1/3 of the pistils changed u get more of a high, and when 3/4 of the pistils have changed u get a heavier smoke. As a bud ages it converts THC to CBD and CBN, which gives the user a more lethargic feeling.

I dont think u should be to concerned about your leaves. I hope this was helpful and good luck with your grow. Your pics make me very envious