White balance is the process of removing unrealistic colour casts, so that objects which appear white in person are rendered white in your photo. Proper camera white balance has to take into account the "colour temperature" of a light source, which refers to the relative warmth or coolness of white light. It is a setting on your camera which is used to control how colours are captured in different types of light. Colour temperatures range from cool (blue tint) to warm (orange tint). Using the right white balance setting will eliminate unwanted colour casts that can ruin your image and make it appear unnatural.
The first photo is my best image because the white balance is correct as well as the setting which fits with the photo. Personally, the second photo isn't great as I do not like the white balance setting. Maybe with another location I think the photo would look better.