Sure! I'll get right to it then!XDThe technique is called Finger-Shading. (you may have heard of it before?)Anyway, use a high-graphite pencil (4B-6B) to shade the area that needs shading lightly. (I'm assuming you already know some basic shading techniques, so just go ahead and shade that way as per normalWhen you're done, use your index finger (make sure it's clean, of courseXD) to smudge and spread the graphite slightly, making sure that you keep within the lines of your drawing. You'll find that the high-graphite pencil spreads quite easily.The result should be a nice, extra-light gray shade over whatever you've just given the 'magic touch' XD It really helps to create a contrast between the skin of a character and the white surroundings of the paper. From there, just shade more and repeat the process of blending the graphite nicely together for the areas where there is darker shadowing. I guess my picture is a good point of reference for the final outcomeXDIf you have trouble understanding any part of this little tutorial, feel free to clarify, and I'll answer you the best I can!