I began with my normal software and then exported it to Artrage...
If you're still switching between software then you might want to experiment doing it the other way by starting loose in ArtRage and then tightening up in software you're comfortable with.
When you import into ArtRage you get all the colour and value but the imported image doesn't have any "paint" information about wetness or thickness so they don't always blend as satisfyingly as something that was started in ArtRage.
Another trick you can do is to create a layer underneath the imported image and lay some paint on this. This is a good way to create impasto texture effects without messing up the colours and details as the thickness of the paint below shows through. Then if you want to you can flatten it down and the imported layer "inherits" the paint thickness below and will blend a little differently.
And one thing to remember is that when you repeatedly export and import a single pic with ArtRage it will gradually darken the image as the textured canvas lighting gets "baked" into the colour information when you export and is then added again if re-imported.
It's not an issue if you're only exporting once but if you export from ArtRage with the intent of bringing it back then you should temporarily turn off the canvas lighting by pressing F5 just before you export.
Also experiment with different paper/canvas textures and grain sizes. That pic looks like one of the basic papers that have very little grain and they blend in a very smooth and slippery way with the palette knife. Using something like the Essential Canvas will give a much more textured effect to the blends.
Terrific painting, by the way. You've really captured the likeness and expression in the eyes and that part of her personality is very recognisable here.