Fashion illustration serves multiple purposes, including creating realistic representations of clothing designs, conveying the designer's creative vision, and helping clients visualize the final product.

Collage is not a common technique used in fashion illustration, as it is more often associated with fine art and mixed media.

The overall composition is the most important element to consider when creating a fashion illustration, as it determines the visual impact and coherence of the artwork.

Fashion illustrations are typically more detailed and refined than fashion sketches, as they are intended to be final representations of the designer's vision.

Perspective sketch is not a common type of fashion illustration, as it is more often used in architectural and landscape drawing.

A croquis is a quick and rough sketch of a garment, typically used to capture the overall shape and proportions of the design.

Wood is not a common material used in fashion illustration, as it is not a suitable surface for drawing or painting.

When choosing colors for a fashion illustration, it is important to consider the complementary and harmonious relationships between colors to create a visually appealing and cohesive design.

Surrealism is not a common style of fashion illustration, as it is more often associated with fine art and conceptual art.

The best way to practice fashion illustration is to combine different methods, such as copying the work of other fashion illustrators, taking fashion illustration classes, and drawing from life.