Sorry, Marc, but the way this pine is developing is no good.
You need to cut back the trunk to the first node (the lowest set of branches), from which three good branches radiate. Use the one on the left as your new apex, wire it upwards and you'll have a new trunk with enough shoots close together to develop into better branching than you have now. Shorten the other two branches, so they will backbud.
Also have a look at this website, especially at the species guide and "pines":
http://www.bonsai4me.com/
It's one of the best sources of info on the Internet, and the guy who set it up is one of the best bonsai growers in the business.
Lisa