What style anime is peach girl?

I see a difference in the way the characters in peach girl look compared to... Say... School rumble. Peach girl characters, along with Nana, have different styles as far as how the faces look. Characters from peach girl and Nana have Big eyes, small noses, and, in a way, wide mouths. One Piece is another anime with the same style. I didn't know if that was a different style of anime or not. Thanks so much.