The illustration was created using Affinity Designer because it is suitable for making vector-based illustrations with clean and simple shapes. The design uses a combination of Pen Tool, Brush Tool, Node Tool, and Shape Tool to create the different elements in the picture, such as the character, trees, sky, and field.

The Pen Tool is used to create and shape custom objects, especially parts of the character and the landscape. The Shape Tool is useful for creating basic shapes such as the circular field lines and other simple elements. The Node Tool is used to adjust the curves and points of objects so they have the desired shape, while the Brush Tool can be used to add simple details and refine certain parts of the illustration.

The composition is arranged with the main character positioned in the center as the primary focus. The trees and sky act as background elements, while the curved white lines on the field help create depth and direct attention toward the character. Overall, the combination of these tools in Affinity Designer makes it possible to create a simple, clean, flat-style illustration with a balanced composition.