A few years ago, I picked up another scrapbook that had cels and promotional photographs in it. Here is one photo that was sent out to help publicize the movie and the animation process. This photograph was used in one of the publications posted earlier.
All of the pencil notations were actually part of the photograph -- not added later.
Comparative Size Promotional Photograph
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From “Snow White” (1937). Promotional photo of the comparative sizes of: Doc, Snow White, Grumpy & Dopey. Dated: 9/28/36. Scrapbook photo. [10"W x 8"H] Acquired 2003. SeqID-1415