Here’s a ground based image of comet ISON taken on 19 November by the Marshall Space Flight Center’s 20-inch (508 mm) in New Mexico.
My own efforts have been thwarted by cloudy skies thanks mostly to the mountain range to the east, plus they block a good bit of the lower angle look to the horizon. Once the comet goes around the sun, another mountain range will come into play (the Adirondacks of New York) but they are further away and are not as much of an issue. The snow and bad weather promised this week will pass and the first week of December hopefully will be a good one.
Larger versions available here.