Well the basis for a good Layout is a good plan, and I can see you've done that - so that's a good start.
Your Layout is clearly expandable, either by simply expanding the current Track plan and making it a larger end-to-end Layout, or by going full circle and making it a "tailchaser", encompassing such things as a Fiddle Yard etc..
Ballast - I use Brush-it-On from Modellers Mecca, about £5 a bag, but you're some way forward with your Ballasting, so it's maybe not an an option.
Good luck anyway.
Your Layout is clearly expandable, either by simply expanding the current Track plan and making it a larger end-to-end Layout, or by going full circle and making it a "tailchaser", encompassing such things as a Fiddle Yard etc..
Ballast - I use Brush-it-On from Modellers Mecca, about £5 a bag, but you're some way forward with your Ballasting, so it's maybe not an an option.
Good luck anyway.