Thanks for the clarification, I didn't know that. However sorry but I have to say that I like the new art a lot more (personal taste of course). Although I've always loved junjou and sekaiichi I didn't like the old art very much because I found the figures (faces, hair, body parts, etc.) very squared and angular (if I may say so), and the proportions a bit unnatural (especially those of the hands xD). At least in my opinion this art is way better cos it's much more realistic
Actually, if you've seen drastic improvements in the art style, it's probably because she shifted from traditional art to digital art, and somewhere along the way, her art style became softer and less crude. She's been developing as an artist and refining her style, which is why the notorious 'yaoi proportions' of the past, are no longer existent. She's more concerned with the anatomy of her characters.
Also, if you've seen Sekaiichi Hatsukoi, you'll know that she's probably got a team working alongside her, or a bunch of assistants who draw the backgrounds while she figures out all that is to do with the characters themselves.
I suppose you should look for other mangas then, because it seems as though this art style is here to stay.
For some time now seems that Nakamura is not the one drawing this series nor Sekaichii. I had read that she was just the artist and the writer was another person for both series. If she writes them or not, what is clear that she is no longer the one drawing them. The new art is boring. the character's lost the style that made Nakamura famous. and the sex scenes are no longer beautifully detailed and nice. In japan is normal for publishing comps to change artists and keep using the original artists names when characters and story belong to the publishing comp instead of the mangaka. I bloody miss the old art. I barely read this anymore since its hard to see this boring new art style. wpuld be great if anyone has a clue to what happened to Nakamura with Junjou and Sekaichii