If you have the cash for it, i'd suggest going to the auction house and looking for a good two-handed weapon with a lot of dps, str and agility or stamina on it.
And a slight change to your talents would boost dps a lot at your level. Assuming you want to go pure retribution for the maximum damage possible, i would:
-Take all 5 points out of divine intellect. You haven't much +intellect on your gear (nor should you have really) so you're getting very little benifit from those 5 talent points.
-Take the 2 points from Eye for an Eye. It's just not a very good talent.
-Take 3 out of deflection. This one is more debatable, but i personally always spend talent points to maximise damage while leveling.
Put 3 points into improved seal of the crusader. A lot of the damage you deal to the enemy is holy, and the extra crit is really nice. Start the fight with SotC on like a buff, then instantly judge, seal SoCommand.
Finish improving sanctity aura.
Max out conviction, more crit is always good.
The 3 remaining points, you could either max out Sanctified Judgement (personally i would choose this, your judgements will return more mana than they cost, which really helps you minimize downtime drinking) or put them into Vengeance which makes you a real killing machine.
From there, i would move down the tree picking up everything except divine purpose (decent pvp talent, but doesn't see much use while leveling), and then either improve your heals in the holy tree and pick up divine strength, or move into prot to pick up blessing of kings, and precision.