These are some of my acrylic brushes stuck in a clear glass jar. As you can see, the sketch isn't finished for two reasons, time and the ink pen was going dry. I could have switched pens but rather liked the incomplete look. Also, the object of these sketches are to get as much information down to suggest the subject within a certain time frame. You can see my beginning strokes on the top ellipse with the dashes and then the side curves of the jar.