I was also wondering if Kato might have drawn them. Kato did some of the artwork for the NES Ninja Gaiden series under the name "Runmal," and Ayla immediately reminded me of Irene Lew. The facial resemblance was just striking...
However, that's just my best guess.
I'm processing a slew of scanned pages dealing with the Darkness Beyond Time and containing interviews with what I hope are Masato Kato and definitely Yasunori Mitsuda. I don't want to just flood the Internets with scanned images from a copyrighted book, so I'm going to forward them to ZeaLitY and he can figure out the next course of action.
I can not, not find Benny Matsuyama's story anywhere. I'm starting to doubt it's even in here, and if it is in, it's extremely short. The Dream Devourer has been hilariously fuzzed out as if it were pr0n, so I'm also starting to doubt that we'll get much info on that front either.
Sadly, only four pieces of concept art. I imagine ZeaLitY will post them in a news update or something once I forward those to him.