Hi there,
Your signature violates the Signature & Avatar rules.
The violated rules are:
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The entire size of your signature should not exceed 400 pixels wide by 150 pixels high. Large sections of text that extend the height well past this will be removed. Continued abuse of the rules will result in your rights to have a Signature and Avatar being removed.
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Total size of the images contained in your signature or avatar should not exceed 50 kilobytes for the avatar and 70 kilobytes for the signature. Offending images will be removed followed by a warning,
Continued abuse of the rules will result in your rights to have a Signature and Avatar being removed.
Signature and Avatar rules located here!Please change or remove your signature.
*If you wish to keep the same picture, you can post in this service topic asking to have it resized for free :
http://forums.d2jsp.org/topic.php?t=71583346&f=105 
Best Regards,
Jul