Wow Ross!
The amount of details in the filaments of the Horse head are fantastic....
Keep at it, there is some slight coma on the ETA shot on the stars near the edge of the field, something I think a field flattener fixes if I am not mistaken...? EDIT: Hmmm, seems you have a FFII, was it used?
Otherwise, try Startool's repair module, and gently nudge those pesky stars back into shape
SOOO much detail in Ha, you might have made me seriously consider an Ha filter to be added to my shopping list....my LP is horrid here in Kellyville Ridge.
Cheers
Chris