What kind of graphic software?
I use Darktable a.k.a. a lot like Lightroom. For Image editing.Darktable 1.1.2
, on Flickr
version is up to 1.1.2 http://www.darktable.org/
There is also Rawtherapee which I haven't looked at yet.http://rawtherapee.com/blog/features
Just comes down to how many tools & features you need. As there is Gimp,Shotwell,Gwenview,Digikam,etc...
For Artist is Gimp (photoshop like) Krita paint,My Paint,etc...
Just google search on linux painting or photo editing software.
As you weren't clear about what kind of graphics programs you need.
Most likely Gimp 2.8 is the one for most and installed by default for most distro's.