Finally, I found a picture (though not the best quality) of Maskless Samus. Here you go:
To be honest I'm quite pleased with the look (aside from the dodgy picture quality and questionable choice of background trophy lighting - hmm, green face eh?). Samus manages to look strong yet attractive. I think she has her hair tied up because this isn't the best ending (In Super Metroid at least). In the best ending, she has her hair up and then she stands up and lets it down. But I think in just the midgrade ending she just holds her mask like that and still has her hair up.
I do like Retro's better, though:
Or at least what you can see of it.