It's hard to provide meaningful comments at this stage of development, but here's a few that apply now.
1. If using track plan software, let us know which one and provide/attach a copy of the latest plan file. However, continue to provide images of the plan, as well, for those who don't have the same software. That way, everybody can participate.
2.Consider having 3 tracks to the turntable (since you have plenty of space); one for entrance, one for exit, and one for coal deliveries and ash removal.
3. Your yard needs to be reworked to have a yard lead that doesn't interfere with main line running and that is at least as long as your longest yard track.
4. In your image, there seems to be a lot of space available and not being used. If you don't want suggestions to fill it with improvements, leave it out of your plans.
5. Are you going to build a layout with "purpose" for your trains to run (industries, interchanges, multiple passenger stops, etc.) or just to run your trains through scenery? If for purpose, read Armstrong's realistic operations planning book and add those to your design now. You might also search out and read information about Frank Ellison's Delta Lines model railroad.
Good luck.
Chuck
