Gotta say, though. Non-spoilerish covers should be allowed, as sometimes, the first cover looks awful. Case in point: Usogui.
Vol 1 https://cdn.myanimelist.net/images/manga/1/147323.jpg
The final one https://mangadex.org/images/manga/646.jpg?1537723196
Would have never read if it it had the first cover. Even though the manga itself is is the second coming of Akagi, sans the mahjong.