While I was on my travels on the web, I came across this tip re sizing to consider in putting images up in signatures.
Tips & Warnings Don't add too many images to your signature or people will get annoyed when your signature is longer than your actual messages on the forum. Limit yourself to one or two reasonably small images. Reasonably small image sizes include the standard Web banner proportions of 468 pixels wide by 60 pixels high.
Couldn't have said it better myself! ;D
Wide and low is the key, I think. 60 pixels is not very high.
Last Edit: Feb 22, 2015 18:17:03 GMT -1 by Whisker