What did you tweak with ArtRage? I have ArtRage myself, but haven't used it extensively because it so heavily focuses on replicating real media--I'm not clever enough to take advantage of that so I fall back to GIMP.
I added a few strokes, details , shadows & small dirty thingies with ArtRage. I've also added a paper to get some kind of bump texture on the wall. I'll try to upload before /after pics if you're curious.