Hi Siwei,
I'm very sorry to hear that you found the adjusted printed mural to have a fake quality after receiving the very decent samples of the original artwork.
After investigating this matter, I located an email correspondence between you and our team indicating that you were satisfied with the quality control snapshots we sent you for approval after changing the contrast you requested and you were happy to move forward with production.
Unfortunately, I could not locate any further contact from you regarding your dissatisfaction with the mural after you received it, so we have not had the opportunity to assist you with this matter.
As stated on our website, we ask all customers to inspect their murals before installation and to bring any issues or concerns to our attention as we are proud to offer our 100% quality guarantee, which you can find here: https://www.wallsauce.com/customer-service/quality-guarantee
We would still like to offer our help and ask you to contact our studio team directly: info@wallsauce.com.