It is an art how you hold the graphite pencil while drawing the picture and shading the petals. It is recommended to hold the pencil at an angle, otherwise, you cannot give shades to petals where the light does not reach. The entire task of drawing of the rose flower depends on your technique of holding the picture. It can give shade to the flower up to perfection. Look at the picture/drawing carefully, and shade the inside areas of the flower or petals, where you have missed while drawing.
Creating Perfect Look
There are many ways to rub your drawing that you have just created. The best way is to use facial tissue, it is an effective tool to create a perfect look. You can also use your finger, but it might not finish the look as perfect you can do through the use of the facial tissue. Another tool is the purpose made shading tool, which you can buy at a craft store at a reasonable price. It is the most tricky part of the project and you should take special care to execute this part.
Erase Over-shaded Area
You should immediately erase the areas beyond your outline, which you might have shaded accidentally. Leaving without erasing will destroy the look of your picture/drawing. If you take care while shading the petals, it is less likely you will shade the areas out of the outline, but you should erase immediately, even if you have done it anyway.
Give a final look to your shaded flower in a brightly lit area, and if you are left with any patches unmarked or shaded, do it again carefully. Also, you might have some shading crossing over lines, you can erase them again. The final step is to brush off your eraser and this makes your project finished.