: Who can say me, what is the emblem of Arnor?
: For Gondor it's a White Tree...

: And does exist original JRRT's picture of it?

: Thanks for all repliers...

I can't remember coming across a specific reference to an emblem for Arnor, though presumably it had one. I do remember an illustration by Tolkien of the throne of Elendil. On the back of the throne were the Tengwar letters making up the royal cypher: L-ND-L for Elendil. Perhaps, as Arnor was the senior kingdom, the successors of Elendil retained his cypher as an emblem perhaps in conjunction with seven stars.