Hi Simmo,
quite good as you certainly have lots of signal.
Other pictures I see - show the NGC 2547 cluster as containing blue stars:
http://www.astropilar.com.ar/cumulos...C2547_1_HR.jpg
http://www.robgendlerastropics.com/NGC2547L.jpg
Do you have some shorter sub frames to show their colours?
Maybe you hit the full well depth & lost their colour?
cheers
Allan