I would say that what is already available for linux is far better than what adobe has for image editing and video editing. Nuke and Houdini are much better for editing images than photoshop. Davinci Resolve is a much better video editor than premiere. Painting and vector illustrations are where Linux doesn't have good alternatives as far as I know. At this point there are multiple web based image editors that are far better than the low bar that Gimp sets. Gimp is a relic that most people would be better off forgetting about.
Krita is wonderful for painting and other applications like that. But isn't a full photoshop replacement. It is pretty heavily focused on digital painting.