Please correct me if I am wrong, but I understand a number of street artists have painted on this large horizontal panel in green. That is a requirement.
Looks a bit Banksy to me.
One of them was a well known street artist known as Dvate, who painted the image of his late father. I am doubtful about the information below from The Age, and I could not confirm it. Never mind. It is a nice thing for a lad to do for his late father and I suspect he captured his father well.
This mural is on the left as you approach Richmond station. At the very bottom are the words "James Patrick Beattie 1933-2010". A search of Robert's name reveals he was born in Ireland before moving to England and then Australia, where he worked in the animal feed industry and other mills.
Later edit: Dvate is a talented artist. Have a look at his silo work here.