Only a few things I would suggest as far as gemming/enchanting/trinkets go. Gemming is fine, for enchanting I would suggest blood draining over mongoose and 18 stam to shield. For trinkets, pick up glyph of indominability and the black heart asap. Replace the black heart once you get Jug's Vitality out of ToC25.
As far as gear goes, get Pillars of Might crafted if you can, your next frost emblem piece should either be gloves or chest.
Spec is fine, though I'd suggest either going 3/3 FR and 2/5 Shield spec or 5/5 Shield spec and 0/3 FR, but that is kind of a personal preference anyways so there's nothing really wrong with 3/5 SS and 2/3 FR.
Looks pretty solid for the content you are doing to me other than trinkets.