I think that you need to do a decent amount of practice on shaping. The bottoms of those pillars are very chunky looking to me and don't have a nice, natural, smooth shape. The block mixing is also somewhat odd. There are a lot of random shifts that go on between sandstone, stone bricks, pillars, etc., with no clear pattern. To me, there's not really a clear block that's the basis for the rest of the pattern in any place. Even having a different block for the ceiling as opposed to the wall is fine (and is often good), but when you can't tell what the main block is. If I ever have the time this weekend, I'd like to show you what I mean, but I think that currently, you should try to work on the mixing and shaping, but other than that I think that the general design of the hall is great! It seems really nice to have the small, higher-up sections with the balconies. Vertical floor positions are always a great variable to manipulate when creating a hall, especially in one more based on decoration, and design, such as a Meeting Hall. Keep it up! I'd love to see how this comes out when you finish it (along with interior decoration)!Edit - Finished Dwarven meeting hall and added Final Pictures Section.