I know it is a bit late now and hope the OP manages to achieve his goal, of course he should be able to easily remove his own work.........................

For future reference for anyone else that posts artwork on any forum you would all be much better opening a seperate photobucket account or if you have your own hosting a folder that is only used for forums, then if you wish to withdraw an image from general public view or indeed if you wish to remove all of your images then it can be done easily by either deleting the image from the folder or image account or simply renaming the folder, this will then "auto" update and remove said image from every forum it has been used on.

Best of luck Risto as you have said this concerns nobody else and I hope you manage to sort the problem out