Donald,
Great to see you experimenting with this. The latest link, with the lid down, appears to have the highlights blown out, causing the lightest hackle barbs to break up. This could be caused by your scanner setting, possibly doing some auto-exposure. I turn off all the auto adjustments, and just go for a plain scan. Sometimes I need to do a little tweaking in photo-editing software like Photoshop, iPhoto, Photoshop Elements, or the like. Or the scanner software might enable you to adjust the scan beforehand. The key is to try to keep detail in the shadows and highlights. Once you get the formula right, then it is smooth sailing.
This may be too technical, but it really isn't too difficult to grasp the histogram. This graph has become commonplace on digital cameras and scanner software, showing how the tones are distributed from light to dark. The ideal is to have the tones go all the way across, without actually "hitting the wall" at either end. When the graph tones go up the wall at either side, that means you have lost detail. Your scanner software probably has a tone adjustment scale like this, which might aid in fixing tone problems in the highlights and shadows.
Sorry if this is ridiculously geeky. But I teach it to all my students, who get it pretty quickly.
