Notice, then describe
Name the particular image and the visual detail that interests you. Describe it in your own words instead of relying entirely on a category label. An artist can respond more usefully to an identified example than to a broad assumption about what everyone in a visual category does.
Keep authorship attached
Ask who made the work and whether the image is an original project, reference, study or collaboration. A repost or studio gallery can contain contributions from more than one person. The individual artist’s identity should remain clear even when the work appears in a shared space.
Take the question forward
Confirm the artist’s current public contact and working context. A portfolio image does not establish availability, suitability or permission to copy a design. Discuss your own idea and the actual consultation process directly before treating an introductory message as a commission.