Probably the best blending tool to use in drawing realistic faces is with the use of a tortillion. A tortillon is like pencil that is made of paper with a very fine tip that can help you smudge the parts of your sketch to help you with your shading. So instead of using your fingertips to smudge, which is really a little bit messy, you can use a tortillion which is much more manageable specially on the smallest corners of your drawing which is hard to smudge with your fingers.
You can actually buy a tortillion in art shops, but it’s really not that hard to create your own so I pointed out here step by step instructions to help you make one. All you need to have is a piece of paper, a masking tape and a pair of scissors, a ruler, and a pencil to mark the measurements.
1. Prepare a 6 inches by 3 inches of paper.
2. With measurements 3 and a half inches at the top and 1 inch width from the bottom right of the papers, cut the right top of the paper diagonally.
3. To prepare it for rolling, fold the paper on the right on a little angle.
4. Roll the paper so as to maintain a tip that is pointed. Continue rolling it in a constant angle not necessarily the same with the first angle you used.
5. The tortillion will look like a pencil made of paper with a pointed tip once it is finished. Put a tape at the body once you have finished rolling.
That’s it, you have just created your personal home-made tortillion. Use it to smudge the parts of your sketch you want to blend smoothly. After using the tortillion, just erase the dirt on the tip using the eraser.