I agree that you did a great job and that dark colors are much more forgiving and easier to rehab. The leather of this bag is also soft and it wrinkles easily - but it is a gorgeous bag!
To decide if a rehab was successful I generally ask myself this question "Do you feel comfortable carrying this bag in public?" and if the answer is "No" then I usually decide to attempt more drastic measures - although I know that they may not work.
If this was my bag, I might try washing it again and more vigorously because it may need more than a dunk. Let it soak in Dawn suds and try spot-scrubbing the more soiled areas with soap and a soft brush. You could also tie it up in a pillow case or laundry bag and cycle it through the washer on gentle cycle and then stuff it to dry.
After washing, if I were still not satisfied, I might try using a matching color acrylic hobby paint mixed with Leather CPR to refresh the color, but that's a hard color to match and it would be a last resort for me, but there are others here that are more expert with dying and color refreshing then me.
Below are before and after pics of a similar lime green buckle bag that I rehabbed. It wasn't totally successful but I think that the bag was improved and it passed my test because I felt comfortable carrying it. Good luck!
Rehab challenge! (not authenticated) https://www.ebay.com/itm/233585450356?ul_noapp=true That bag is making me think that the Plaza is in so much better shape! :lol:
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