Great start Ric. As the others have said - wedge and longer exposures appear to be your next step up. From a processing perspective, I think you'll need to look into your colour weights. The colours could purely be from the lack of rich data, but from experience you should start to see subtle tones even with short exposures. This is actually a tricky object to get right from a colour perspective. It contains hints of teal crossed between the green and blue wavelengths. Some image this object with an OIII filter and blend it into the RGB to get the desired affect. Keep at it.
