1. Representation of materials: A large area of the ground is the main drawing object in the plane. Note: don't draw too much, the focus of the depiction is around the main object. You can tile with colored lead first, and then describe the local texture details. Remember not to catch the main target.

2. Representation of details: Details are very important, which can enrich the picture effect and enhance the texture to achieve the authenticity of the picture.

3. Representation of spatial relationship: the downward perspective of spatial change relationship is depicted in place, especially the projection part of the object can not be ignored. Projection can play the role of light and shadow projection, and can also set off objects. Including the depiction of corners and the depiction of plants in space, can well reflect the spatial effect.