We did add the last 8 smilies in the list a while back (those after Mr. Green), with contributions from a couple of forum members.
Wow, has it really been 3 years? I guess so.
https://forums.taleworlds.com/index.php/topic,323595.msg7673637.html#msg7673637
While it's certainly possible we might add more, they'd need to be particularly fitting or useful. Apologies, but at a glance I don't see any above that really seem to fit. Maybe one or two possible ones in the mass that Densetsu posted.
Also, with some planned forum updates, we might end up with some additional smiley/emoji possibilities in future.