Hi, Rob
If you want an image file from FaceGen Artist, your option is to take a screenshot of the viewport.
However, if you don't want to go through FaceGen Modeller, consider the option of downloading DAZ Studio (free), and using it to create the images in jpg, png, BMP, tiff.
You'll export your face created in Artist to Daz Studio, then add it to the model in DAZ.
Yes, it's a bit of a learning curve to learn the basics of DAZ, but the final results can be incredible.