This picture shows a fascinating collection of digital artifacts typical of this camera under low-light conditions. There's just no point in trying to hide them in this shot.

• The halo around Karen's head is made of an over-exposed zone above the hanging lamp which provides most of the illumination in the room (i.e. it's quite bright). Note that the inner part of the circle is actually *darker* than the outer part, though both are featureless (flat color). Actual solarization!
• Low contrast in Karen's face, especially at the right and extending in towards her nose, appears to be ordinary lens flare, rather than an interesting digital artifact.
• Bright yellow highlight on shoulder of magenta shirt (given the things the camera did, and the things I did, to this picture, I wouldn't swear to the original color of that shirt). That patch is missing most of its blue signal. And what you see here is after I've done drastic dodging in the blue channel to hide the problem. You can see a smaller area of the same problem on Peter's shoulder. Imagine how exciting this gets if it happens to a face!
• Dirty blue channel. A huge amount of the noise (random small crap) in the picture was in the blue channel (not unexpected given the tungsten lighting and low exposure). The version you see had the blue channel smoothed out with the dust-and-scratches filter with a radius of 19 pixels -- and it's still pretty noisy, eh? (This was shot at the "ASA 400" setting on the camea, 1/30 second, f3. Many this night were show at slower shutter speeds, down to 1/6 second.)