I think it's fine, although I wouldn't go any "busier" with the tie. But because you're pairing it with a classic charcoal suit and white shirt (hope it's a moderate-spread collar and not a button down, to look dressier) I think you'll be fine.
Several other tips:
1. Enter the room with your jacket buttoned--just the top button if it's a two-button coat, or the middle button if it's a three-button version.
2. Unbutton the coat when you sit down, and re-button...