Tableau - how is it in English?

Tableau - it's a latin word which means a picture of the graduates of the university. It usually is situated in the hall of the university.
For instance it looks so:
http://troll.pam.szczecin.pl/galeria/displayimage.php?album=15&pos=20
But how do we call it in English? If I use a word "tableau" - will it be understood?

I suppose we would call it a poster.

Actually, tableau is French.

Used in English, it generally refers to "a group of people attractively arranged (as if in a painting)" or a particular type of picture.

"Tableau" was borrowed into English long ago, and while obviously French in origin, is also considered plain old English.

"Tableau" is not the word to use. "Class portrait" would be an appropriate term to use.

"Tableau" can also refer to a geographical landscape that is a high, flat piece of land.

Adam, you're thinking of "plateau"

In English, a tableau is usually a deliberately arranged and static scene, sort of like a still from a movie. It usually depicts some sort of narrative.

Thank you very much for your help :)