These were the only two I could think of, though I'm not sure if it's the kind of art style you're looking for (maybe you could give some links of some manga art styles you're looking for??)
1.
https://www.mangago.zone/read-manga/here_and_there_and_us/ (prequel)
https://www.mangago.zone/read-manga/achira_kochira_bokura_no_are_kara_to_kore_kara/ (sequel)
2.
https://www.mangago.zone/read-manga/ganbare_nakamura_kun/
https://www.mangago.zone/read-manga/motto_ganbare_nakamura_kun/
FIRST OF SUMMERS
not sure if these classify as what youre looking for but maybe try it?
Hell and high water
Nocturnal dogs
And try works by Asada Nemui i guess? Her art is exceptionally well done I feel. and while her characters do look the part (as in that they are bl) I never felt they ever tried to over-beautify the characters. their art is simple clean and apt for storytelling bl or otherwise. (personally recommend Sleeping dead)
def check out https://www.mangago.zone/read-manga/sangyang_the_wanderer/
this just so happens to be the list i found sangyang in, and it has a ton of other shounen-esque bl bangers with unique artstyles as well
BL + seinen/shounen vibes, BL + noir vibes (Absolute favorites II.) https://www.mangago.zone/home/mangalist/2521674/
Anyone got any bl that's art style looks shounen oriented
*Not sure if this makes sense but I just want something where the art style doesn't look so doll like, I don't know how to explain so hopefully someone gets it