These sheets were put together during production of The Sword in the Stone. They show partial Milt Kahl drawings, focusing on Merlin's head as well as his hands. At that time Milt couldn't be bothered with creating model sheets that show the character's construction, turn around etc.
He would start off with a few scenes for a character, then it was up to one of his assistants to arrange poses for model sheets. The tricky thing is that other animators like Frank, Ollie and Lounsbery had to figure out by themselves what the exact proportions are and how to work with Milt's graphic shapes dimensionally. Not an easy thing to do!