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The scans depicted that the artist group had more grey matter in the area of the brain called the precuneus in the parietal lobe. That region is involved with many skills, but could possibly be linked to controlling your mind's eye for visual creativity.
Lead author Rebecca Chamberlain from KU Leuven, Belgium noted, "The people who are better at drawing really seem to have more developed structures in regions of the brain that control for fine motor performance and what we call procedural memory."

Studying the brain's make-up in experts versus non-experts has been a practice in music ability, complex motor skills, and more, but according to the research paper, "No studies have assessed the structural differences associated with representational skills in visual arts.”

https://www.pinotspalette.com/naperville/blog/creative-life/pinotspalettenaperville-did-you-know-multiple-studies-have-shown-how-artists-have-different-brains-