Thank you everyone for your responses... greatly appreciated.
I agree with the comments about the diffraction spikes - I wasn't really sure about them myself but I thought I would give them a go. Having just started to use Photoshop and the "Astronomy Tools Action Set" the tendency is to use everything that I could...
I think I will process the image again and not add any on the diffraction spikes... try to keep the image a bit more "real".