Hmm.. somthing at his face just looks off to me o.o is it the rather big area between the nose and upper lip? yeah, sure, it is an orc, but that there somewhere feels a lill too accented for some reason
Hey, really schweet! I really like how this turned out; it really says 'Gul'dan' to me, and looks quite heroic! Verah Noice.
I think (aside from "more animations always = better"), my only concern would be about the back-spikes; it's not clear where they come from, they seem to just sprout right directly out of his back. Unless that was your intention, perhaps a 'back-rack' of sorts to which they can be attached?