6. Denim fabric
The denim fabric has a rough texture, and the edges and divisions are often reinforced and decorated with bright lines, with a sand washing effect. Some smart backpacks use denim fabric too. When drawing, use a medium watercolor pen or a pointed brush to paint the base color first, and then use the same darker color to paint the light and dark. After the color is dry, use a small gouache or pointed brush to paint the part. It can also be drawn with colored pencils, charcoal pens, oil pastels and other tools. As shown in Figure 7-30.

 7. Floral cloth
The painting method of flower cloth is generally divided into two types: the painting method and the painting method with empty background. The method of painting the bottom and leaving the flower is a painting method for the bottom flower-shaped bag. The step is to first draw the position and shape of the pattern with a pencil, and then use a sharp brush to draw the background color around the pattern, using the paper color as the color; the empty background method of drawing flowers is used to express the pattern of surface patterns or cloth bags, suitable for single color and multiple Drawing of hot topic bags made of colored floral cloth.

After finishing the pencil draft, directly adjust the same color with different brightness to draw separately. The bright and dark side color processing can be done in one step, or it can be processed after completing the pattern and background color description, such as using dark color lead to deepen the dark part or Cover a layer of transparent color. As shown in Figure 7-31.

Expression methods of different materials of luggage (Ⅱ)

8. Silk fabric
The silk fabric is light, thin and soft, with a soft surface luster, and good drape. When drawing, pay attention to the outline of the bag not to be too stiff. Carry on backpacks rarely use silk fabric. Try to show its drape and soft characteristics. Avoid horizontal folds, and try to Shows its diagonally overhanging wrapper. Color pencils or watercolor paints are generally used when painting, and the light and dark transitions are soft without excessive contrast. As shown in Figure 7-32.

9. Check fabric
When drawing a plaid fabric, the background color is generally applied first, and then the grid is drawn according to the size of the designed grid, first horizontally and then vertically, pay attention to distinguish the depth of the grid. Finally, the texture is depicted, and the outline and structural lines are drawn. As shown in Figure 7-33.

10. Pure cotton fabric
The inner layer of the quilted fabric is filled with styling cotton, down and other materials, and the appearance presents different degrees of bulging. When painting, we should focus on expressing its fluffy texture. And pay attention to the perspective changes and three-dimensional sense, the outer contour line should be drawn smoothly and simple, and the complex changes in the shape should be minimized. As shown in Figure 7-34.

11. Transparent fabric
In the overall performance of transparent fabrics, attention should be paid to the reflection of the transparency of the outer covering on the contents. When painting, the color of the content and the relationship between light and shade are generally drawn first, and then the color of the surface fabric is covered, an appropriate amount of water is added to dilute the pigment, and then the layered transparency is expressed by repeated layers of light colors. Finally, draw the same color slightly deeper than the fabric on the outer contour of the bag. As shown in Figure 7-35.

Expression methods of different materials of luggage (Ⅱ)