Rotated and cropped the two night-to-night photos to show the same field of view and pasted in a side-by-side arrangement.

This was my first attempt at photographing a comet. Even though I had barely spotted it in binoculars a few weeks ago from my hometown of O'Fallon, IL, and even though I knew the comet was now fading, I thought I would try spotting it again over the February 10-12 weekend while on a trip to rural central Missouri (where the sky can get really dark). The nights of February 10 and 11 were extremely dark and crystal clear, and the comet was surprisingly easy to find in binoculars. Of course, being very close to Mars helped tremendously. I had taken our camera (Canon Rebel T3) and tripod, just in case. Having no night-time photography experience, myself, my son-in-law suggested a good starting point for shutter speed, aperture, etc. The first few shots on February 10 provided decent results, so since it was very cold and I didn't want to fool with making minor changes, I just left the settings alone. I went back out the next night to try again with the same settings. The results were a little better (clearer) and clearly showed the comet's change in position against the background stars and relative to Mars. Mars' movement was also clearly visible from one night to the next.
These aren't the greatest pictures. But considering the cold conditions and the fact it was my first attempt at photographing a comet, I am very pleased with the results!