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Guessed wrote:

Would an elf gain a bite attack from wearing the face of a tengu? If you've taken a gorgon's eyes and face, would you have a gaze attack?

No and no. You get no natural attacks or special abilities, because spells only do what they say they do and it doesn't say that.

(Now you're going to say "but it doesn't say you lose your natural attacks either, so the orc whose tusks are gone can still bite with them?" To which I firmly reply: Um.)

It looks to me like the big difference between this and a polymorph effect is that Beast Shape etc. all mention form and Transplant Visage only mentions appearance. Those words are synonyms, but I'm fully ready to say that they are distinct enough that changing form would give/change/remove a natural attack while changing appearance would not.

It's a strange spell. Thanks for bouncing ideas around about it w/ me.

You could look at the spell Monstrous Extremities as a good reference for how they handle extra natural attacks.

You change one of the extremities of the creature touched—arms or legs only—into another shape of approximately the same size and mass. You can choose a tentacle, a hoof, or a wing.

The subject must take approximately 10 minutes to familiarize itself with the function and movement of the new extremity to use it properly. These new forms do not allow the subject to fly, run faster, or swim better; however, they do act as natural weapons of the appropriate type, and the subject can use them to make secondary attacks while making attacks with weapons as a full-attack action. The secondary attacks are made using the creature’s base attack bonus –5 and adding only 1/2 the creature’s Strength bonus on damage rolls. The subject cannot hold a weapon or use any item that would ordinarily fit into the slot of the changed extremity. The subject can receive the benefits of this spell multiple times.

Seems to me you could cast that as many times as you have limbs.

According to the wording of the spell, the caster removes the skin and eyes from a recently dead creature and then fuses them to their own face, taking on the guise of the deceased. But how different can the subject and caster be? Would an orc caster still have tusks jutting up through an elf's lips? Would an elf gain a bite attack from wearing the face of a tengu? If you've taken a gorgon's eyes and face, would you have a gaze attack?

What is and isn't affected?

Is the limit based on bone structure, or more on what sort of strangeness the GM is ready to allow? Can grandma take off her face and there's the big bad wolf underneath?