What are the restriction for a signature, couldn't find it anywhere.

You need ToriPrime in order to have a signature image in your signature.
More information:
http://forum.toribash.com/faq.php?fa...#faq_toriprime

Actually, You need Toriprime in order to have a Sig Pic. One step below VIP

I know I know, but I am making one for someone so I need the size.

650 in width.
150 in height

650x150 is the limit.

Ok great thank you.