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For those interested in painting/illustration/photography/digital graphics and similar media, here are some hashtags in use:
Art
Artists
ArtistsOnCoSo
Comic
CosoArt
CoSoPainters
CoSoPainting
CoSoPaintings
CoSoPaints
CoSoPhotography
DigitalArt
DigitalArtist
DigitalIllustration
Draw
FineArt
Illustrate
Illustration
Paint
Paintdrools
Painter
Painters
PaintersOfCoSo
Painting
Photographers
Photography
Portrait
ProCreate
Watercolor