Gear:
Switch out the gems in your belt to epic gems. One expertise gem will keep you capped, so change at least one to strength. I can't be bothered to fiddle with Rawr's gemming templates to see whether two strength or one expertise and one strength would be more DPS.
Switch your weapon enchant to Berserking.
Buy the emblem of triumph libram, that gives 200 strength on a Seal of Vengeance tick.
Switch out the Banner of Victory for a Darkmoon Card: Greatness (strength version) if you can afford it, otherwise go for the Mirror of Truth.
Talents and glyphs:
You're missing Seals of the Pure, and you're also using the Glyph of Exorcism when you should be using the Glyph of Judgement. This kind of looks like a half and half PvE/PvP spec, though you're missing key talents in each. If you wanted to keep Vindication and Divine Purpose in Retribution, you could do something like this:
http://www.wowhead.com/?talent#sV0bZVZVfrtbIuGdIfsu0Gcm0.
All of those changes in Rawr boosts your estimated DPS from ~6400 to ~7300 for Patchwerk style fights, assuming you use the correct rotation. That's with the Mirror of Truth, the Darkmoon Card: Greatness adds another ~180 on top of that.