I took the liberty to reupload you a smaller Alan pic & eidting your post, the pic you used was a bit too big.
anyways , my personal favorite is Alan. and I like her over Satomi both music- & looks-wise. Asuka doesn't have anything special going on, but her debut song is still pretty nice.
I think while Satomi is very pretty, but to me it seems her vocal abilities are limited & she relies a lot on her backround singers. like in "Tabibito"
Alan is definitely the best singer vocally and her super high pitch range gives her songs a very unique feel, I can't wait for her future singles. and IMO Alan is the most beautiful of the three.
Asuka is a good singer too, but her debut song is the least interesting out of the three. I'm baffled were the "she's ugly" comes from, especially compared to namie ?