Final answer:
Each artwork needs to be carefully analyzed to rank them based on use of overlap, high-low placement, aerial perspective, and color for depth creation, drawing on examples from the Hudson River School and the techniques of individual artists.
Step-by-step explanation:
When ranking the artworks by Holbein, O'Keeffe, Ma Yuan, Homer, and Holmann according to their use of overlap, high-low placement, aerial perspective, and color to create depth, a careful visual analysis is required. The Hudson River School artists, including the likes of Thomas Cole and Albert Bierstadt, emphasized the powerful expressions of nature using scale and color to create depth, evoking a sense of awe. The art of Ma Yuan may use subtler cues like the blurring of distant elements to suggest aerial perspective. Meanwhile, O'Keeffe's 'My Backyard' might use color contrasts and diminishing sizes of shapes to suggest depth. Holbein’s mastery of detail and texture would exemplify the overlap technique, while Homer’s 'The Country School' could illustrate use of high-low placement by organizing figures and objects within the pictorial space. Holmann’s use of color in 'The Golden Wall' is critical to create an illusion of depth, potentially ranking it high in that category.