What is a significant feature of the first lines drawn in a sketch?

The significant feature of the first lines drawn in a sketch is that they show the main proportion of the sketch. When starting a sketch, establishing the proportions helps ensure that the overall structure and relationships between different elements are correctly represented. This foundational step provides a framework upon which additional details can be built, allowing the artist to accurately develop their work.

Establishing proportions early on allows for better spatial awareness, making it easier to adjust and refine the sketch as more detail is added. This principle is fundamental in drawing as it ensures that the dimensions and relationships between different aspects of the subject are maintained throughout the sketching process. Proportional accuracy is essential for conveying a realistic representation of the object or scene being depicted.