Redoing fireplace

Hello, looking for some thoughts/advice redoing my fireplace.

Going to remove existing mantel and tile (photo of black tile, whole mantel) and replace with new tile and a simple beam mantelpiece at the top. Given this change, I have a few questions on aesthetics and what to do.

  1. Is it best to keep the same tile footprint on the wall, or should I extend out further to match the current full footprint including the mantel? Without any sides I want to make sure it doesn’t look off in terms of size.
  2. For tile edging, is it better to use something curved or angled, or a flat edge? Or is this just aesthetic preference?
  3. My initial thought on mantel was to place above the tile where it ends (see second picture). The full wall is about 14’ high to I don’t want to go to the ceiling, but is there a preferred approach? Should I go higher and have the mantelpiece over the tile?

First time doing a fireplace so any insight would be really helpful. Thanks!