In this case, you can see the date order which the drawings were submitted (image below), so Damien's drawing replaced Etesia's drawing because it is newer, and I usually do this to highlight newer drawings.
Steamboy's drawing isn't the correct height, unless I were to go in and adjust the image, since there currently is no auto-resize feature built into the database.
Sometimes people post in the forum that they want a different primary drawing selected for a building and I usually change it. (If you ever do so, please post a direct link to the building for me to use). In this case I've switched back to Etesia's drawings for the two Busan IPARK towers -
https://skyscraperpage.com/diagrams/?cityID=10
