To determine how "Sketch of a Woman" represents a student’s skill and style, consider the various aspects of the artwork.
If the artwork showcases attention to detail in the figure's features, accurate proportions, and effective use of shading to create depth, then the response "the use of proportion and shading" would be the most appropriate.
However, if the sketch employs color in a unique way or has a strong sense of perspective, then "the use of color and perspective" could be more fitting.
Texture and color could also be critical if they add to the overall aesthetic and bring the sketch to life.
Lastly, if the artwork captures flowing lines and dynamic movement, then "the use of shading and movement" may be the best choice.
Without the actual visual of the artwork, the best answer would likely hinge on which elements are most prominent in the sketch.