First, you made the right choice. Get more stamina if you are over the 540 defense skill (in your case that is).
There are quite a few things you can do. Several pieces of your gear is not enchanted. Bracers, Chest, Feet. That could be another 1k health for you. Also you have to upgrade that block trinket. Keep the trinket, useful for some fights but if you are doing ICC whether 10 or 25. You will need more health. Your avoidance for ICC is bad. With Chill of the Throne. Your dodge will go down 20% leaving you susceptible to more hits, and Deathbring Saurfang hits hard as you can tell. Also you have only 24k armor. I'm sure it goes up a bit more towards 27k once buffed, but I would even say that might be a little low.
Biggest overall difference that you can do if you want to do raid tanking is upgrading your gear as you may already know. You will get more armor and everything with upgrading. Get the Black Heart from Regular ToC 5 man. Good trinket with easy access to. Glyph of Indomimably (however you spell it) is also a solid trinket to use if you don't have anything else right now. Also you can probably toss that hit gem away for more stamina or a gem that gives stamina + another stat.
Wait till Aggathon or another Warrior tanks comes in, they can probably give you more precise advice.