Comment posted Oct.30th, 2012, viewed 18 times
Are you scanning in colour, Linda? You're losing almost all of the lighter tones, and that happens more if you scan in B&W. If you can, scan in colour and at least 300ppi. If you want to, you can reduce the scan later to greyscale.
As far as I can see, your second row of blacks are pleasingly dark, although there appears to be a lot of white or light content - possibly caused by your rather heavily textured paper.
I can't tell from your scan how many directions you shaded in or if your lines are visible. If you want to draw realistically your pencil lines should never show. When they do, the viewer's eye will always detect it and their brain will simply label it a "drawing" instead of something to treated as real life.
Shading in many directions will fill some of the lighter areas that you previously left. Or you can shade using tight circles. In time you'll find the technique that works best for you.
The 4B and 2B in particular need to be as black as you can manage, because the more contrast you can generate between your darkest tone and lightest (the white of your paper), the greater will be the range of tones available to you. And good solid blacks will add impact to your drawings and help with three-dimensional rendering.
The image below is the best I can do with your scan - which isn't much!
In response to image: