The picture isn't but you must remove "photoshop work." 650x350 is the biggest you can have your signature including text.
Refer to the rules next time please.
Oversized Signature*: Maximum of 350 pixels in height including all quotes/text/pictures in it and a maximum of 650 pixels in width with all text/quotes/pictures. If this offense is repeatedly broken, you will simply be banned from having a signature.