It's a cool shot Mark. Great data. Need to repro though. Try a little more saturation and watch out for the stellar profiles. Your star are white clipped and your shadows/mid tones have lost their dynamic range. It seems compressed. If I had to guess I'd say a Shadow/Highlight tool in pS or similar. I reckon you have a corker in the making there. Worht spending a little time on it and play around.