Quote Originally Posted by nightbringer View Post
Noone's mentioned the Sunny 16 rule?......
May not have been pertinent in the context of the question raised by the OP.
I think the OP was asking about what indicators in the image are people using to determine if the image is correctly exposed.... and not really about how to go about capturing an exposure from the camera itself.

Sunny 16 and other such generalisations are used for trying to capture an exposure at the time of shooting(for times when a meter is not available), whereas the replies given to the OP are more in line with using a histogram as a guide, blown highlights and lost shadows not necessarily the evil many believe them to be and using creative license to determine artistic merit, and so on.