opss, apology for the large image. will take it down shortly.
im a noob, all of you are correct that the difference is the auto and cloudy WB.
was at the central last saturday around 3pm and it's cloudy outside. I thought the WB is to compensate the camera to as close as the human eye, but look like the AUTO is doing a better job than the cloudy.
"Cloudy" is an average preset, Auto will adjust according real input from the scene. So it's obvious that AUTO might do a better job sometimes. But presets have their purpose as well. The third option is WB tools (exposdisk, graycard) and the 4th option is RAW. Many ways to skin a cat, find your own preference - and how to resize images for posting.