It isn't really a style, it's more of a medium. There are "styles," but, say, look at the body proportions of, say, Spike:Rastelin said:You are right about this. Not much room for creativity in that style. I mean of you try, it isn't anime anymore.Andy of Comix Inc said:Well, because every anime girl looks exactly the same and is drawn exactly the same way
compared to the proportions of Naruto
two similarly-aged characters, but two very different approaches to their bones and such. Also, <link=http://media.animevice.com/uploads/1/11465/331594-mio_akiyama_through_the_ages.jpg>this very short manga strip does a good job of explaining the typified "look" of anime through the ages. If you recall, Western Animation does similar - each decade adopts various traits, be it Steamboat Mickey-era exaggeration of movements or the mid-90s look seen in Nickelodeon and Cartoon Network shows of the time.
Anime itself really is just a medium, not an art style, and while certainly there is no disputing that various characters across series look like they exist in the same universe, there are just as many hack, play-to-what's-popular animated series from Europe and the US. Anime and manga does have a very Japanese flavour to the way the characters are built, but same can be said of any culture's drawings.
Not all anime looks completely unique, but not every anime character - especially not every anime girl - is drawn identically. You won't mistake a Salor Moon character
http://static.tumblr.com/2qi7fek/PQZlqbmdv/tumblr_ljxtkhnz3s1qeqx6yo1_400.jpg
for a Black Lagoon character
http://vexed.ca/wp-content/uploads/2010/01/f0259l.jpg1.png
...even if they are seemingly built from the same mould, so to speak.
I've read a lot of really interesting essays on this topic (I used to be really passionate about becoming an animator/cartoonist, I did a lot of research, read a lot of books), the Japanese creative culture is one that is absolutely varied and distinctive and it always saddens me when people seem to clump all "anime" in the same melting pot. I think there's a certain degree of... well, I don't want to say "racism," but cultural dissonance, that stops people from being able to look past similarities of a medium that has constantly proven to be an evolving form, especially stylistically.