There have been a couple theories that he is either the Herald Ishar or the Herald Jezrien. However we do not know if there is, indeed, anything special about him.
First off, Shalash is female. Anyway the statue was presumably removed do to it being defaced by Baxil's Mistress. It has been theorized, and practically confirmed, that she is actually Shalash who is traveling Roshar destroying/defacing depictions of herself, often by gouging on their eyes.
I do not believe it is a reference to Scadrial. I am of the opinion that it refers to the Cognitive Realm/Shadesmar since it matches the descriptions we have of it. The person "with his head of lines" most likely refers to a Cryptic, a type of spren that resides there that appear in Shallan's drawings.