It is not a PLZ account. Use the Thumb code.
The Thumb code only works in your profile widgets and Journal however.
Thumb codes do not show up as pictures in comments. Only your Profile widgets and Journal.
(Please also keep in mind when you post something like that, it can be considered spam. If you're trying to check to see if something works in a comments section instead of actually sending a message, do so on your own profile to test it, or click "Preview" on your comment rather than actually posting it. In "Preview," any text that is meant to translate into an image should appear as the image. If it does not, you may have entered the text wrong, or it is a kind of code that doesn't work that way in the comment sections. )