In fact, before reading your code, I want to tell you that there are two possibilities to prevent you from displaying the pictures in the signature file!

First, the online photo album you use has no fixed link. In this case, even if you use the picture link, the link will no longer work after restarting! !

Second, your forum does not support the display of signature pictures, which may also be a reason!

Third, your code is wrong. The correct code is [IMG] picture link [/IMG].

Do you think you can show it if you change it now?