Oh, my goodness---that illustration is from a children's book I had when I was very little. I think it was called "The Shiniest Star." It was written all in verse. Little angels were shining stars and bragging about whose was brightest. As I recall, the quiet little angel who kept on with his work instead of bragging---his star became the Christmas Star. I think I still have it somewhere!
Someone has it on eBay:
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Thanks for sharing Merry, that is so sweet. I just love that picture ♥