first grow :) any tips?

So this plant is halfway through its 7th week. This is the first time I have grown, and I am looking on it as an experiment, and a chance for me to get my bearing for growing. I have one more which is growing taller, and pistils are not visible. maybe i am a bit impatient but i suspect a male.
There are a two fan leaves with a spot of yellowish/brown however I do not know the cause of this. The spot is roughly an inch in diameter.
A friend is also growing these same seeds and his plant has much more vegetation (taller, bushier, more leaves) and I am wondering why mine are less so.
They're getting about 16 hours of light, however not constant as compared to indoor grows under lights. No nutes have been given yet but I am looking for a completely organic grow.
Due to temperamental weather, I have been bringing them inside at night. Would it be unwise to provide them with a couple hours of some (albeit not very powerful) artificial light as we often have overcast days, so there is not constant sunlight. I have been watering thoroughly when the soil begins feeling dry a finger-pokes worth depth. very excited to be finally growing although i am aware not to over-love them and be impatient.
Photo on 2012-07-05 at 15.36 #3.jpg

@Kaendar South west UK. i topped my other plant and it proceeded to die, however, i never had much hope for the poor thing. we keep it on a consistent schedule and it is beginning to flourish thanks to our freakishly sunny weather. Plant is getting smelly. How would LST be beneficial to my plant?