It seems so obvious - the scans of my artwork have been disappointingly washed-out. It finally occurred to me to check some of the extra settings on my scanner. By changing the darkness, contrast and colour balance, I got the scanned image to look like the actual painting. However, that's onscreen, and I know different monitors make images look different - a large monitor with high resolution makes an image look paler. I suppose if I want to print the image I might not want to make those adjustments.Anyway, here is the same picture I scanned last week, with the adjustments - darker, more contrast and more magenta. On my monitor, at least, it looks just the same as the original.