>>26638079It actually showcases the main silhouette in a pleasing way. I can't say exactly why Valerie's sheet has more facial expressions but I assume it's show off the function of the sleeves, like Olympia is shown with her cape open and closed.
The main forward facing artwork of the final stages are nearly the same size as their other angles. The artwork that goes on to be the official portrait art for the gym leaders is the largest object on those pages.