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Keep in mind that forum rules say: Signature size limit is 600 pixels wide x 240 pixels tall.
This means that square or vertical signatures can easily exceed that size (and risk being deleted by moderators) while still appearing to be quite small.
I HIGHLY recommend designing your signature as a horizontal banner to utilize the available space.
This is what a 600x204 signature looks like. (it's a bit below the maximum height allowed.) The actual physical size is dependent on your monitor but if you measure the signature below and compare it with yours, you'll have a pretty good idea what's acceptable.
Moderators have been a bit casual about enforcing signature sizes, but that could change at any time. The are some truly gigantic signatures on the forum.