Two ways.
First way: Right-click the picture and then click "Copy Picture URL" in the menu that popped up.
Second Way: Click that small white link that says "View Raw" on the post with the signature image. It gives you the actual text, along with all the code that formats it.
Basically, View Raw does the function quoting's supposed to, since quote doesn't give the whole deal on RPG like most forums.
Like I said, though, the sig gets smushed. I didn't realize the limit was that small. Trying to fix it with vectors hasn't worked thus far, and it'd still be hilariously tiny if I did that right.
If you don't like the sig as is(when/if you put it up), I could try to edit the sig to be shorter/longer via chopping up and arranging pieces of the original picture.