>>281951858
Nice Prison >>>>> Otr >>> Hima-Ten > Kiyoshi > Ichi >>>> Shinobi
Nice Prison's cover is the only with the character doing something instead of merely posing. He looks like a stripper at the beginning of a bondage session, but since NP is a gag manga this probably was intentional.
Otr's cover is a generic portrait, but the flames and the frame make it look better. Also Otr looks adorable there.
Hima-Ten's cover is generic as fuck, but since the manga is generic as fuck as well the cover suits it well.
Kiyoshi's cover is generic as fuck too, but since the manga has a more unique art style and premise having a generic cover actually harms the manga.
Ichi's cover is plain bad. Ichi's body looks malformed and the bright red not only hurts my eyes, but it's rarely associated with magic. Something as simple as making the background blue like in promo art would have improved the cover a lot.
Shinobi's cover is the worst one by far. The background has a sickly green color is just awful, Yodaka looks like he's constipated, and the weird angle makes it look like he found a spy camera in the toilet.