The only thing I would change is the top left corner. Use a lighter background with grey triangle. So that it actually shows as light to dark on the diagonal. There isn't to much gold, and I can see the secondary design with the triangles. I think it will be a beautiful modern quilt. Stand way back from it and possibly take a picture and graystyle it. I love it.
Or if te triangles are not sewn on, I'd do all te triangles in the gold. Then the triangle pattern would stand out more. JMO