Iv'e been playing around with the 15 - 1-12 image of comet Lovejoy.
I used gradient mapping in photoshop, and this false colour image shows the extent of the tail out past canopus.
Yep tried inverted views, brings out a little more detail but found the gradient map option the best on the image. Your image goes much deeper and shows the tail very well.
Gradient mapping might be the way to go as the comet gets fainter.
No chance of imaging tonight though.