Hi Steve,
The halo looks great but the dark ring is wrong. In a SHO or HOO image the halo hugs the body of the "spare tyre" very tightly and the area closest to it is probably the brightest part of the halo.
I'll get to processing mine as soon as I get a chance. It seems I now have a surfeit of data with more arriving from SRO every day. Good problem to have, I suppose
Cheers,
Rick.