His bold expression fits him very good here. And the eagles in the background a bit like a shine or crown emerging behind him. He looks convincing that he actually might be the greatest of arms in Arda.
He's very beautiful, noble, powerful. This is my favourive from all Silmarillion portrayal! I agree with the other comments, Eonwe trully looks like that! I especially love his glance. His armour and clothes are also perfect. Great work!