that lower branch looks quite weak and the top very strong, so it needs addressing.
once this years growth has hardened off and opened out, you can feed - prob around the end of this month/septemer time, for around 4-6 weeks. This will prevent this year's growth extending too long
in the winter you can then go about stripping back needles to leave min 5 sets per shoot at the tip, on strong areas,(generally the crown or strong branches) and down to maybe 10-12 sets on weaker areas, leaving alone vey weak areas (inner branches, low thinner areas, shoots on branches closest to the trunk).
you can either pluck each individual needle by hand, or cut the sets down to around 2-3mm. The bud axil is located inside the base of each needle cluster, so pulling the whole cluster out pulls the bud axil out with it, and therefore the tree's ability to release new buds.
Very strong shoots should be cut back to inner buds before they kill them off. Waaaaaaay to much to explain in on e post, so buy this book, and look at the feature on Kimura, it's absolutely essential reading.
http://www.stonelantern.com/Pine_Bonsai ... b1pine.htm
