Hum... You know you don't need to program on the same platform that your game will run, right? (I still don't know what you mean by "graphics", since it's not games.)
Otherwise creating a mobile game would be pretty insane.
Anything related to GPGPU programming with sane tooling like what NVidia Insights, Instruments, PIX are capable of.
Has RenderDoc finally started to support shader debugging, with watchpoints and and everything else that one expects?
Engines like Unreal and Unity.
Visualization tools like Maya, AutoCAD, Catia, 3D Painter, OctaneRender, InDesign, Photoshop, Illustrator,...
CMYK and other typesetting colour workflows tooling.
Yes probably you will refer one or two of those have a Linux version with a feature subset, which is ok, I guess, when the kingdom is actually a principality.
If it is king for dev work, it should win at it across the board, regardless of what work the dev does.
Game devs are also devs.
And in VFX, UNIX was already dominant thanks SGI, not Linux.
Which tend to use it for rendering farms in most cases, while graphics oriented people stick with macOS and Windows workstations for the daily workflows.
