The markings may change a little as time goes on, but for the most part I'd say yours are what they will be. Obviously the fish will continue to grow slowly, and as he does, his pattern may change slightly, but nothing drastic.
I just took a peek at your guy- he's a looker! That lateral line may or may not remain prominent. It is pretty dark right now, and that may fade, and the smaller black splotches may darken, but like I said, probably nothing drastic. I like him the way he is!