1. Prepare a blank canvas, or open an online drawing tool.

2. At the top center of the canvas, write "Welcome to Lezhi" or a similar theme in large fonts. The color of the fonts should contrast sharply with the background to make it stand out.

3. At the bottom of the canvas, you can list some important scenic spots or landmarks in Lezhi, such as Chen Yi’s hometown scenic spot, Lezhi Baoguo Temple, etc., and use smaller fonts to indicate their names behind the scenic spots.

4. On the left side of the canvas, you can draw a meandering river, which is the mother river of Lezhi - Yanghua River.

Some natural elements such as trees, birds, etc. can be depicted next to the river to emphasize the natural beauty of Lezhi.

5. On the right side of the canvas, you can display some Lezhi delicacies, such as Lezhi barbecue, Lezhi lotus root noodles, etc.

Pictures and names of these delicacies can be displayed side by side or layered.

6. In the four corners of the canvas, you can add some elements that reflect the characteristics of Lezhi, such as the sun, national flag, cultural heritage, etc.

7. Adjust the layout, color and font of the screen to make it look beautiful and harmonious.

Through the above steps, you can create a promotional poster with Lezhi characteristics.