Signature policy is still the same as it was 2 years ago: https://forums.totalwar.org/vb/faq.p...faq_faq_sigpic

No, there's no limit. One can include 500 smileys in his/her sig as long as total
-10 kb max.
-no sound.
-max 500 pixels wide, max 150 pixels high (includes 'spacing' between pics).

Big signatures increase scrolling and loading times.