Krystal is twice Fox's size in this complete redesign of Krystal as a more alien species and multiple "first-contact" interactions with Fox McCloud.
DeviantArt is the closest thing we have to an image archive from that time. I found the oldest Krystal-related image, and the oldest Krystal fanart on DeviantArt.
Just a little promotional art in a big exhibit full of Rareware's history.
400MB of Krystal goodness!
Krystal is taking on Star Wolf in this action shot fanart.
Bidding has already started.
Nintendo of Japan put out tons of Star Fox resources today!
The acrylic on canvas work is by TheSecondDimension.
HDMI proof too, while we're at it.
It confirms Miyu's and Fay's canon status too.