1, when depicting symmetrical things, the center line is the most critical reference line, so when depicting cylindrical things, it is usually to draw the center line first, then the lines on both sides, locate the width, and then draw the height by comparing the widths.

2. Take glass as an example: the general shape of glass is initially linked, and the upper and lower arcs are almost parallel.

3. Draw the main cup first, then the lemon slices and ice cubes, so that you can be more sure.

4. When sketching the outline carefully, the details such as the cup mouth should also be drawn, so that it will not be lost later.

5. When you first draw light and shade, you basically don't consider its texture and light sense. You can start by squinting at the general light and shade and determining the position of the dividing line between light and shade, but be careful not to draw too much.

6. Further deepen, pay attention to the ice in the cup at this time, but if you draw it carefully at this time, it is easy to draw some places very heavily. Using big lines can avoid this situation.

7, or don't try so hard to refine, adjust the overall relationship between black, white and gray.

8. Starting from the most interesting places, we usually choose the main things, the places closest to the observer, because these places need to be particularly detailed, paying attention to retaining strong highlights and showing the texture of the glass.

9. When drawing a cup, start from the dividing line between light and dark, while keeping the ice in the cup light-colored, or use a plastic eraser.

10, the ice exposed from the cup mouth can be painted for 2H with a light pencil to prevent the color from being too heavy.

1 1. Refine the shadows of lemons and the ground.