http://www.mangago.zone/read-manga/kinbaku/
http://www.mangago.zone/read-manga/kyoushitsu_no_yugami/
http://www.mangago.zone/read-manga/gintama_dj_kabe/
http://www.mangago.zone/read-manga/aigan_shounen/
http://www.mangago.zone/read-manga/gamushara_mob_rape_2_chikan_jigoku_hen_kuroko_no_basuke_dj/
http://www.mangago.zone/read-manga/summer_wars_dj_donna_ni_wabi_temo_yurushimasen/
http://www.mangago.zone/read-manga/hua_hua_you_long/
http://www.mangago.zone/read-manga/love_prism/
http://www.mangago.zone/read-manga/enka_zetsurin_ou_to_yokubou_ouji/
^They are all yaoi mangas and I don’t actually know what you count as a good art style but hope it helps.
You can also check out my list and you might find some mangas you’d wanna read.
http://www.mangago.zone/home/mangalist/346750
Can someone recommend me some hardcore SM / BDSM manga? Anything is fine but I'd like something with a nice artstyle.