What does Big E look like

I’m read The First Heretic and I’m at the part where Big E shows up after Lorgar pimp smacking Malcador and I know everyone sees him different.

But does anyone actually see him as we see him in art and I haven’t read the Seige of Terra books yet obviously but what’d he look like fighting Horus is there and writing when he’s in his golden armor like how we see him