Here I imagine an Alchemist brewing potions in the desert.

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Winsor & Newton ProMarker Brush Set : https://amzn.to/3VPLazB
Handbound sketchbook : https://amzn.to/3vMC9g6
Faber-Castell PITT Artist Brush pen set : https://amzn.to/43UTfVD

Drawn with ink pen, starting the the grey promarkers to define the shapes, then adding more details with the ink fine liners.

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