Plant looks great! is thier a reason you're only running 12 hours of light? Autos can take up to 24 hours of light - I run on 18 / 6 - check my diary out as I am just coming Into week 5 and pre flowering!
@Cosmonauta, I would definitely give it more light through out the whole grow because otherwise you wint get it's full potential in veg / flower for a big yield. Unless you're trying to keep them small, I'd go for it with the light you wont be disappointed