As long as Cherry Pie knew that you would do a Panto instead of the custom design she asked for then you did not mess up. If you switched to a panto without checking first.... Not good business to do that. I have seen so many posts here about how a quilter felt the LAer ruined their quilt because what they got back wasn't at all what they expected nor asked for.
The panto you chose is pretty and looks nice, but if CP was expecting a different motif inside each ring, well think how you would feel. As long as she gave approval first you did not mess up.
Doesn't your machine have a computerized set up? There are digital designs out there made specifically for quilting DWR quilts. They are beautiful and only require you to line up the machine head properly for the computer to execute the design for you. That may be something to consider in the future.