You did not do anything wrong. Bob posted in your "pictures" thread and you could not expect that he did not want you to use it. MexQueenFM asked you not to use his picture and you did not. When Bob changed his mind, it's not your fault and you are not to blame.
I'm afraid your apology is likely to fall on deaf ears. Bob is not a guy you want to fuck around with and no amount of sorrys is going to change his mind now that he is on the warpath.
If I were you I would seriously consider plastic surgery and a one way ticket to Lapland. He will in time of course hunt you down and his vengeance will be of biblical proportions.
On the other hand he probably won't mind.
fatty.