The difference between design sketch and traditional sketch! !

The focus of design sketch is design ~ in order to express your creativity, you can exaggerate and deform appropriately ~ the whole painting style has a sense of design,

Traditional sketch is mainly realistic and pays more attention to recording.

Both are freehand brushwork and realistic.

As for the lines that others say, perspective and realism only serve the picture and what you want to express. They are only means to an end, and cannot be used as qualitative points.