The first image Only one is rendered in monochrome, while the second is n both works, the figures are rendered in profile.
The artist's approach in rendering these scenes includes horses and cornfields in one of the works, and in both works, the figures are rendered in profile. The costumes are rendered as flat fields of color and pattern in only one of the works.
While your other options might hold true depending on the specific images, the prompt states that tipis are present in both. Therefore, this is the most universally accurate description of the two images.
Therefore, both answers involve careful analysis of the provided details and accurately identify the key characteristics of the images and the artist's approach.