It's nice,but...
that line you noticed? It's a part of his forehead protector.
As for the piece itself, I'm not sure if you used the burn/ dodge tool for it. But if you did, I strongly suggest you don't use it anymore. It makes you look like a novice *though, I assume you're fairly new to painting to begin with

* You've made the metal on the forehead protector WAYYY to shiny as well as Naruto's skin. The whole thing looks over glossed to honest.
Take some time to look at painting tutorials, and look for references from photos, paintings, and anything else you can find! You'll be surprised at what you'll find
