there’s an extremely diverse range of drawing styles employed in manga, from the ultra-realistic to the highly stylized to the cartoonish to the crude to the minimal
if I was to distinguish the art styles from each other, the place I would probably start would be boys’ comics vs. girls’ comics (shonen vs. shojo). girls’ stuff tends to be very romantic and ornate in layout, have Euro-looking characters with impossibly huge and starry eyes and all that
most anime seems to be drawn using roughly the same style, though there are fine distinctions