OK, one of my first thoughts was "what's the name of this comic and where can i read it?". Really nice! I would say that the Avatar loks a bit, ahem, bulky to me and his sword probably be a bit "swordier" (it reminds me more of a short sword). But all round, a very nice picture.
That's Rhana Dandra, the eldar's great final battle against the forces of chaos, isn't it? And that seer with the spear in the first rank, he even looks like Eldrad ulthran, even if he's suppose to be in Ulthwe... Well anyway that's a fine piece of art!