Sometimes it can be so tricky to photograph artwork. I finished this one for my December show but never posted it because the camera wasn't picking up quite the right red. It's more accurate now. My friend described it as the color of kids cherry cough syrup. She says that's a good thing. There were major glare issues too that I've not entirely resolved.
Another one of my paintings, purple mostly, is so horribly distorted by the camera that the new *gack* color makes me wince. Bright greens often fare poorly as well. I have gotten a bit more sucess photographing them with southern lighting. Perhaps the full solution is a new camera :D, or even more fun- a photography workshop! Doesn't this one look fun?
As a general rule though, it works out well. Some resources I've found helpful are in the book "Art Marketing 101", this tutorial on light boxes (handy when the weather's bad) and Howard's well rounded how to.
As a last resort, for me, there's the scanner. My scanner only does looseleaf sized pages. Here's a recent sketchbook entry.
All in all, summer photography adventures are much more pleasant than winter ones.