Because they don’t have time. Alot (not all) artists are on a time crunch and they have to simplify it so that they can get everything done in time and sometimes they have to make some unrealistic body choices because they’re easier to draw. That’s not all artists tho some people believe that whatever their art style may be is good or they’re still actively learning how to draw and how anatomy works.
As for reccs honestly if you don’t already then start reading manga they tend to have more time than manhwa artists and they have pretty good art ofc not all the time though
The novel's ones are covers and one page arts mostly so the artist are focused on that and that take a lot of effort as compared to making /drawing everything the manhwa artists who have to draw every novel line into something
It is simply the effort division
Also there are some good artsyles despite that but we have to find them
Sometimes even if the art is quite good them the narration is lacking
And most of the time the cover artist of the novel isnt the same as the manhwa adaptation. I only know one that has the same artist in the novel, promo, and adaptation https://www.mangago.me/read-manga/my_mom_entered_a_contract_marriage_bored_corona_kids_version/
yes! I'm well aware and know that those are just one pages for covers and they don't take many efforts or time like the ones with adaptations where they have to draw for thousands of panels. But i just hate it when their proportions are soo out of reality and it just threw me off mid reading. About manga, I don't like how it's black and white so I haven't tuned into them after discovering manhwa.
I agree. I just want to see novel arts to be the same as adaptations which is of course gonna be a really hard work. But some of the art is just too overdone to the point that it kills the mood during reading. For example that straight historical story, I forgot the name, but the characters look so hot in novel art but in adaptations, they all look like children!

But why can't the art style of manhwa/webtoon adaptations reach that same art from novels? are there any stories that have that kind of pretty like water art style WITHOUT twinkifying or making V shape jawline or unrealistic body proportions like those y/n and ceo corny crap? I feel like I've been always asking for pretty art stories.