I was just reading through. Leaf structure is a great way to tell whether the plant is indica or sativa. The fan leaves on an indica during vegetation will usually have a maximum of 5 leaflets per fan leaf. While the fan leaves on sativas in vegetative states can reach as high as 13 leaflets per fan leaf. When the plant goes into flowering, the leaflets will decrease down to 1. After a harvest most people who do re-green their plant, do so untill there are 5 leaflets on each fan leaf again.
Also for telling whether you got yourself a sativa or indica. Some sativa will still veg under 12/12. So unless you are forced to use a dark period greater than 12 to make your plant flower, more than likely its got indica in it.