Hi CHWong and Kelvin,
Thanks loads for your sincere and objective comments. Yeah I know where the problem lies, however, it's a bit too late to do anything about it. I should have realised the camera was shaken during the shot! I've enlarged the pics in the camera shortly after I've taken the shots, but no problems were detected, or I was not able to detect the problems. Either way, this pic turns out to be crap loud, as I don't really appreciate "flaws" in my masterpiece. I'll do much better next time. :)