The marks of the brush have played an important part in paint techniques since first Titian, then Rembrandt, began to exploit them in contrast to the smooth surfaces and subtle blends preferred by earlier painting artists. Brushwork can be very helpful for painting texture and adding detail to objects in your painting. The extent to which brushwork is used in an acrylic painting depends on the painting artist. One painting artist might use brushstroke similarly to their work with oil, while another might exploit the value acrylic has with flat color. Clicking on the different brushes will give you a general understanding of how that particular brush is used.