Normally when you see creatures turned into humanoid they tend to just look comical and silly, like those walrus "Tuskar" things from WoW. From this however I get a real sense of strength and feeling of pride coming from him and I think the back story fits him well.

With the mussels I will say one thing, the ones as his chest neck and arms ar good, however the ones going down the side of his torso look more like roles of fat. Admittedly penguins are meant to be fat, but not in an obese American kind of way but a tuff survivor form.