I was just about to say... Needs more data
Im thinking something like 12 to 16 x 30 minute subs in Ha to give that lum a bit of a kick up the bum... get out to dark skies, get some really really long lum images to bring out the dusty areas a bit... colour should hold up as it is... maybe a few more subs just to smooth out the dimmer areas when you apply the "Kick in the pants" Ha+L data..
Man... I wish I could image right about now.. Im suffering "reprocessitis" I've been hitting every image on the forums just to see if I can make a difference to it, downloading data sets off the net to see how I go processing it.. I've even hit people up for raw data just to get an astrofix..
Regards, Astrojunkie.