This has held true for awhile, but I've noticed that a lot of users don't actually know about it. With the introduction of spoiler tags, some rules regarding signatures have changed.
1. If you have a picture you want to put in your signature, but it's too big, you can put it in a spoiler tag! As the image is hidden, the pixel limit doesn't really matter.
2. You can have multiple spoilers in your signature. (Although, you...