Your question is Design Success Metrics Framework. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You've shipped a design change and want to evaluate whether it actually improved the experience. You need a way to look beyond visual polish and connect design outcomes to user behavior and business results.
What metrics do you consider when evaluating the success of your designs?