On the film, Sleeping Beauty, Eyvind Earle was given total artistic control by Walt Disney, overseeing all visual development but it was on Lady and the Tramp that this style first found its way into a Disney feature.
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Eyvind Earle Lady and the Tramp Bella Notte Concept Painting, Lot #98712
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Replicating Disney Concept Art by Eyvind Earle : Lady and the Tramp Bella Notte Scene #gouache #demo
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Bella Notte: Eyvind Earle on Lady and the Tramp
Eyvind Earle Lady and the Tramp Concept/Color Key Painting with, Lot #98746