Honestly I think you should be able to start tanking a few of the bosses with the prot gear I see here, take note that you can spend forty emblems and get http://www.wowhead.com/item=40734#. They are the best until the drops in icc, besides spending a few thousand gold getting the crafted ones. Same thing with you boots you have equipped. Crafted = much better until those drops. There is a better tanking badge ring, not sure which one it is, but as soon as you get in there and do some trash pulls and become friendly, you can get the first ring from The ashen verdict. http://www.wowhead.com/item=50375 these also level as you get rep with them. Best thing to do is get in there and try it out with your guild, and grab that ring.
EDIT: Alot of being able to do the fights depends on your raid members, there skills and abilities and the gear they have + Experience in icc.