I saved over 360+ concept art of animations, models and textures from the entire Banjo-Kazooie series. Just stuff I collected over the last two years.
https://imgur.com/gallery/wvc2Mmj
This album is beta Banjo-Kazooie series content. This one is more well known, but there might be a few things you didn't know or see before.
https://imgur.com/gallery/AAPZR67