Signature pic size

[TxFireman1972]

I'm having problems trying to figure out how to put a larger pic in my signature. Where I load my pic for my signature is sais:

"Note: The maximum size of your custom image is 500 by 100 pixels or 19.5 KB (whichever is smaller). "

I'm using photobucket to host the pic but that doesnt allow me to put a very big pic with those guidelines. I dont want a huge pic like some have but would like a little bigger. Thanks for any help on this.