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An early layout of the design as a collage of images with the mountains in the foreground
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Some sketches focusing on Skip
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A version of the image with Skip's front paws included and the characters breaking out of the frame
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We decided to leave Skip's paws out of the image and make his face a little more realistic.
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The initial black and white version of the image in a scratchboard style, created in Photoshop
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I added mountains in the background, using a light purple hue to convey a sense of distance.
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I then blocked in the main colors.
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For the final image, I added some subtler shading and highlights.