it looks okay, some yellowing leafs are from calcium deficiency , but if you have access to nutrients , right about now would be a good time to add PK booster and humic acid. Other than that, you won't like hearing it, but you probably have a good 4 weeks ahead of you before it reaches it's potential, could be sooner, what you have to do is check the trichomes with a 50x or 60x magnifier to be sure, just looks at the "frost" if the little bulbs are transparent it's not ready yet, you want fully white milky. Hope this helps ! š