Hi Beetlejuice and welcome to the forum!
My first comet was Halley also and have been adicted to comets after that.
The picture you mention has been posted here
http://www.iceinspace.com.au/forum/s...=16333&page=30
It is my opinion that it is a montage. You can read the reasons in that thread. I've been doing photo retouching on the computer now for about 13 years and can usually spot a "photoshop" job.