There are MANY pictures online of vaginas. Are you referring to human vaginas? Do you mean the outside of the vagina or the inside? The first link is to the wikipedia article with some good pics and diagrams. The second link is to wikimedia commons pictures of female genitals, mostly external photos.
There's a great deal of variability to the outside appearance of a human female's genitals and there's no set "normal" appearance. A vagina is a tube of stretchy tissue, typically pink or reddish in appearance. In my experience, they're typically quite wavy in appearance near the opening and do not feet straight or flat inside.