Notes for Improvement:
Chamfer margins are too wide and the shoulder margins needs to be clear that it is wider than the chamfer margins. Margins should have a clear uniform width. There are areas, especially the lingual wall being too sharp and it needs to be smooth out.
Currently, you have an undercut on the labial wall, you need to take the gingival 2/3 of the labial wall to have it almost parallel with the lingual wall (or both should have slight tapering towards the path of insertion.) Take note of the two plane reduction, please see video that talks about this.