Well that's the thing he doesn't have to make a check since he isn't disguising himself as an individual. Mundane disguise for minor alterations requires a check "Your face paint is running". He is using magic to create a physical change which is actually there. Just as if Elvas polymorphed into a dragon there is no disguise vs spot to see "hey your just a dark elf".   You either can see through the magic or you cant, now if he tried to be Aragozzia the ancient red dragon that's when the disguise vs spot comes in "Hey you look nothing like Aragozzia!" but he would still look like a red dragon. (though at that point people might be suspicious enough to think he probably is a wizard anyway)<br/><br/>I suppose it could be argued that "Himself" counts as a specific dark elf rather than a generic dark elf but the changes are so minor I dont think he could mess that one up. He is using two spells to create his form, reverse gender to have female parts (though his male form is easy enough to mistake as female) and an illusion effect to change his coloring. I suppose that means if you really examine him you get to save vs the illusion.<br/><br/>Actually your certainly close enough to get a save against disguise self. If you want to take that route it's a Dc 21 Will save (there is a separate glammar for seeing the white dress as his white armor but much lower dc so if you pass that one you pass both). If you pass you would see the same person but with his actual coloring's.