Hahaha! It must be a 19th-century inspired countenance!
Cowher, don't let the smile police bother you! I'm firmly of the opinion that fake-smiling for photos is ridiculous and overrated. Not only can it make otherwise normal people look like deranged lunatics*, but it's a new tradition (only a couple of decades old) that needn't be followed. Go with the 19th-century and early 20th-century style. Either a neutral facial expression or a look of determination will serve you much better than a cheese-eating grin.

*disclaimer: a natural "in the moment" smile can be a good thing, but far too often people develop a contrived "photo smile" that looks nothing like them, and is never seen in normal life, making their photos look odd and grotesque. Let us rebel against this unnatural trend!