>-> I really really cant agree with this. That is unless you are trying to be something else than a manga artist. Manga is BASED off reality/realism just like anything else...but the truth is...it isn't realism, its an exaggeration (a distorted view) of it. Look at BOTH real life AND manga, but don't confuse the two, realize there is a difference.
I would also highly recommend not going and copying other manga art for now, because it will only serve to give you a distorted view of reality. And reality is what we're trying to recreate, even if it will be stylized.