The histrogram shows the distribution of brightness values within the image. In your image there is a predominance of near white features such as the light coloured background. This will naturally give you a peak near the extreme right. Whether a image is over/underexposed depends on how you want it to be and not by looking at the histrogram.
Anyway, IMO, the colours have been overcorrected, such that it has a slight blue tint now. The colour under the white tent shelter should be slightly warm, so a mild yellow cast is actually realistic and acceptable.