I went out last night (Thursday) and took some images and video of Comet Holmes. The video was not what I had hoped; my setup is rather, ah, primitive (I hold the camera up to the eyepiece), so I won’t show it here. But I did get one not-too-bad image.
This is pretty much what it looked like by eye, too: a bright nucleus with a circular fuzz around it. The yellow glow is striking; when the comet erupted there must have been lots of dust in the ejecta, which reflects and slightly reddens sunlight. All the images I have seen look pretty much like mine, except some have more stars in the image (I guess this means I faked it). Several more are showing up on BAUT, too.