I thought it would be cool to portray Reshiram as sort a proto-bird. Maybe as like an ancestor to Ho-oh is what I was thinking. He has been adorned with silver bangles which he was worshipped by. He is considerably less mammalian than you may be accustomed to, but I thought it would look strange if I threw a goat head on a dinosaur bird body. Alternative title for the paleo art aficionados could be Macroraptor
I really like this. In some websites, it says that Reshiram is based off the feng-huang, which is a phoenix-like bird from Chinese mythology, almost always portrayed as female. Of course, this means I automatically also think of Reshiram as female... Anyways, this is just the perfect mix of phoenix and dragon. Or feng-huang and dragon. Whichever floats your boat.