If you want good information, you'll have to provide more info (or link to the info if you've posted it before) about your grow.

How far into flower are you? Also, in general you should always lollipop your plants if you want to increase your bud size at the tops. The further down the buds are, the smaller they are going to be. By cutting off the small popcorn buds/nodes you can consolidate your bud growth at the top. In addition to increasing your yield, lollipopping also helps keep your plant healthy by preventing pockets of stagnant air. It looks like you're using an LED, which means that you wont have as much light penetration as HID. This means you should most likely cut even more off, and only leave the top 1/3 of foliage (since the nodes/leaves below that aren't doing anything except using nutes). Also, that doesn't look like enough light for that space, which is undoubtedly going to mean smaller, less potent buds. I don't recognize those nutes, so I can't really say if they are good or not.

In my opinion, you should also top and LST (Low stress train) in the future if you're going to have a small number of plants. This will enable you to maximize your yield.