TIP OF THE DAY !!!!

Do you know what is the most important tool while drawing a sketch  other than pencil and eraser ? ( HINT: It is also the most important thing when you are going on a dinner ). Yes, It is the handkerchief or a napkin. You must be wondering why? Because by keeping your handkerchief or napkin on the drawing and your hand on IT prevents your drawing from getting dirty, Which believe me you wouldn't want after your hours of hard work !