Lovely look to it when viewed at small size, the colours are quite grand (in a Chesterfield type way) and there is some good contrast at play. When I view it at large size though the spiderweb-honeycomb shapes in the nebulosity seem to suggest slightly heavy use of some shrinking/sharpening filter, the minimum filter in PS does this pretty easily..?
Overall though, a cool looking image Andy, you certainly have an artistic eye
Mike