Fred Moore was credited with redesigning Mickey and with designing the centaurettes in The Sorcerer's Apprentice.
The first two pictures here are from a blog called Fred Moore's Archive. The third is from the Channel Frederator Blog.
And more girls at Scribble Junkies.
A color drawing is at Mayerson on Animation.
The next image is from The Cartoon Cave.
The last drawing is for sale on Ebay.