Let me first try tell you about the stats
Reforge any hit/expertise > mastery.
Yellow gem slots should be with 40 mastery gems!
Keep your dodge and parry at average, which it is, but don't use 40 parry gems, use 20 parry & 30 stamina instead.
Health is of course very important for a tank, but avoidance is much more important to enchant and gem for.
It looks very good, except, you don't really need gag order. I'd recommend putting the two points into incite instead.
Glyphs look pretty much great!
Hope this helped,
Clone - Sylvanas EU
Clone - Horde @ Sylvanas EU