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When the picture is small and does not cover the entire surface of the shape without losing its quality, then you have the option to tile it. Tiling fills the shape surface with a small image by repeating them as if they are tiles.
You can fill the shape surface with some image and tile it using the Shape.Fill.TextureFill.IsTiling property and setting it true. Please see the following sample code, its sample Excel file, its output Excel file as well as the screenshot for a reference.

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