Copy and paste more stairs, resize, rotate and make shadows
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repeat
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repeat
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cut, copy, paste and cleanup dog. Add color by painting using "overlay" layer
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cut, copy, paste and cleanup woman
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use the same process as the dog to get color.
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Add cracks by using a small soft brush and then trace over top of that with a smaller hard brush. Add a little bit of depth to it by making some parts thicker.
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I added rain drops
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I added water drops to the cracks as if it were leaking and also added a puddle