Not an insult or anything but... 12 weeks!?
Most plants look like this at week 1 to 1 1/2, what lights are you using and what nutrients?
These look like the 23 watt cfls im using or atleast something i wouldnt dare flower under, ive seen all my friends try it like that and never did they succeed..
I have a friend thats growing a window plant which looks similar at around probably the same time span like yours (first month flowered with a 40 watt lamp and switched between sunlight a lot too), you should encrease your light and something is definately stressing your plants.
if you are going to flower try to flower under something ATLEAST 100-200 watts, if not you're almost always better off using sunlight.
I hope you can use this,
Peace and good luck!