looking good so far just a couple of things, i think your white could stand to be a little smoother, use a couple of thin coats instead of one thick coat. As for scratches think about this kind of wear will occur your only likely to see it where components have slid over each other or where edged combat implements have struck the surface or fallen masonry. Try to make the damage look logical and not over the top. Dont ruin a great job so far.