There has been a lot of trouble regarding signatures in the past and while there are limits, they obviously are not stopping members from getting around them. All signatures, not just images, but everything in it, should be smaller than this image.
I don't care how you do it. I don't care how you feel about it. Large signatures, overly animated signatures, and anything in between is going to be deleted. Everyone has a week to adjust their signatures to the appropriate size.
Really, most signatures are fine, we just are getting tired of sending out messages all the time. I sent out a bunch last night fresh after returning from the airport so I finally am sick of this business.