this


to

this


yup, its the same person.

D. Gray Man was the most major change I saw but also Bleach and Reborn have changed a lot too.

We discussed the topic of Art Evolution a couple of weeks ago using the tvtropes link below as a jumping point for much of it.
Bleach is probably the first example to jump in my mind.
http://tvtropes.org/pmwiki/pmwiki.php/Main/ArtEvolution

Black Cat, I guess. It started as

and ended as


Basically the art just got a bit prettier, which I'm not complaining about. :3

Keroro gunsou. i don't have any pics, but it changes loads!

One of the biggest I've seen is the art change in Hana Yori Dango. It went on for over 10 years so of course the art is going to change xP but it's amusing to make before and after pics of it..lol. Also what amazes me the most is the art in it changes so slowly that I didn't even notice that it changed until I was at like vol. 30 and went back to vol. 1 to hear Makino's famous catch phrase "This is my declaration of war!" I was so surprised!
Before (:


After :O

There are a lot of reasons why this happens. First and for most its not clip art. Because it is not clip art or an architectural design you cannot expect the same dimensions on a per drawing basis.

I can assure you if the artist him self had to draw out the SAME panel twice for two different books they will both have small variations that are slightly different. To all the complainers out there, unless you can do a Dot per Dot replica without the use of any machines except for an eraser, pen, and a pencil. Shut up and continue reading your favorite manga that you probably downloaded.

another thing that happens is that artists will gain apprentices. As is the case with the Artist of One Piece taking the Artists of Fairy Tail / Rave master as their apprentice... or so the story goes. Also you have groups such as CLAMP which is 4 artists creating the project. Again each artists will have their own niche's that only they seem to create.

I never look at the art and go, "man this artists suck!" instead I look at all the elements that encompass the story that I am reading. Unlike drawing the characters, a bad story can remain a bad story forever. Where as a bad piece of art can become prominently good. This is a way for the viewer to see how the artist is progressing in both story and drawn skills.

D Gray Man
Bleach
Naruto
One Piece
And Noblesse

:D

Personally I havn't seen as big change as in Katekyo Hitman Reborn! . Some ppl have linked photos from it here so i won't give examples you can look from earlier post. :)
At first I think the drawing was so simple and pretty horrible, but it's now a lot better.