“Hmmm … this one is probably Ritsu’s face … err, no, maybe Yui’s … or … Azunyan’s … ?” As your Nendoroid collection grows, there might be time when you’re starting to get confused with which faces belong to whom. Fortunately, someone from 2ch decided to create a huge “poster” consisted of Nendoroid faces to tackle your problem. Although it’s still a draft – with only recent Nendoroids made themselves to the list – it’s still worth to look into.
If you have some spare time, maybe you could fill in the blanks and expand the listing to contain more Nendoroid faces, then share it with us so we can have a complete face listing. ^^