Lal, I can not say exactly what happened, but I think it is over-lighting. The sun was on the left. I would very much like to know repair it, but I still do not know! Thank you for observing this and comment!
Try Google's Picasa3 to repair it,which is free to download.But I don't think it is overexposure,check your camera too whether fungus has attacked it or not.
Lal, thank you! You are all right! I checked it out and had a huge stain. I cleaned and I think the picture will improve. I will try tomorrow during the day with the light. I blew good pictures because of my lack of observation. Lal, you were great! Many thanks!