Since I started out i amateur astronomy 2008 I have observed 15 comets. Without doubt the most memorable of these was comet C/2011 L4 (Pan-STARRS). It was discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) on Hawaii in June 2011 and reached perihelion i March 2013.
After the passage, as the comet rose from below the western horizon, I made numerous sketches. The comet peaked at magnitude +1, making it an easy catch. It also spawned a beautiful tail.
Beneath are some of my sketches. I used both my dobsonians and a number of different eyepieces for the observations, so please note that the field of view (FOV) varies substantially between the sketches. Also note that during the first and the last observations, the comet hoovered just a few degrees above the horizon making the observations difficult and reducing the comets appearance.