I love ArtRage, but even so it has a few glaring errors.
The largest one (in my eyes) is the absolutely HORRIBLE compression it uses when I use the "Export as image.." option to save as a JPG file.
To show you an example I've taken a cutout of an image I've drawn, and I'm showing you two versions (see below).
1) The first is a JPG exported from ArtRage. Notice how pixelated it is and how the colours have a very grainy texture.
2) The second is first exported as a PNG file (because it's a lossless format), and then I've opened the file in IrfanView and saved it as a JPG using 100% quality. Notice how much smoother everything is.
I hope you'll be able to fix up a better compression method for the next version of ArtRage.