The advantage a multi-spectral analysis have over the x-ray machine is the multi-spectral machine have the ability to be used on large art that is hard to move.
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What the artworks of the ancient civilisations commonly feature are the animals depicting their paintings, murals, and sculptures. Animals were sometimes worshiped by ancient societies most specifically the Egyptians. We can see in their artworks where the person's head gets replaced with a head of an animal.
If you're using paper, find the object you want to use for the texture. Put the paper on top of the texture. Whatever media you're using (pencil, charcoal, paint, oil pastels, etc.) lightly brush over the paper with your pencil for example, while your texture is underneath.
