First there are lots of missing enchants:
Shoulders: PVP enchant (10000 Honor in Stormwind) or Hodir Reputation enchant (hard to get and not that much better)
Cloak : 16 Def (Armor or 22 Agility if you're already Def crit capped)
Chest : 22 Def (Hp if you're already Def Crit capped)
Bracers : 40 Stamina
Gloves: 20 Hit (Threat) or 18 Stamina (Health) or 20 Agility (Avoidance)
Belt: Eternal Belt Buckle with a 24 or 30 stamina gem
Legs: 55 Stamina 22 Agility Armor Kit
Boots : 22 Stamina
Weapon : Blade Warding (Avoidance) or Accuracy (threat) or Weapon Chain (Cheap).
Next your gems are a mess:
Pure stamina in Blue slots
Stamina/Def in yellow slots (if you apply the enchants as described above you ought to be Def-Crit-Softcapped so no need for pure def gems)
Agility/Stamina in red slots
Never ever gem orange gems (like that parry/def thingie there) or pure def (unless you really can't reach the Def-Crit-Softcap in another way)
Finally your spec/glyphs fails hard:
You need Glyph of Divine Plea
Seals of the Pure is not that great and those 3 points you spent in holy are uber crap.
You don't have Touched by the Light
take this one:
http://talent.mmo-champion.com/?pala..._9eYb,Hr,10676
3rd Glyph is personal choice : Hammer of the Righteous or Righteous Defense are decent here.