Advice about topping? Should I?{pics}

it will help, how old is it?

dude i saw this thing on you tube called URBAN GROWER "ug" he look up mail bag...ug mail bag...someone may have the link..anyways he cuts his plants naked from a third of the way down and just leaves the top one main cola.. but they would come out like over 2 ounces and more...bigger then his foreamrs its crazy...so i dunno what would yield more...or maybe a combo of both....look it up you will be amazed

I would fill that pot up with soil. Your 2 to 3 gallon pot is now about 1 gallon with the amount of soil in that pot.

I would bend the top down so all the branches end up the same height.
I would not top the plant.

i would definately invest in more light too, looks kinda stretched.

More light or closer light, it is stretched way too much like nob said. That one I wouldn't top I agree with bending the top over or even the whole thing.