I think you need to apply the Read & Write policies on your AWS s3 bucket. https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_examples_s3_rw-bucket.html

Can you please try with page reload to see if your latest image is still showing or not? Sometime browser need time to load it.

But it's totally related to Read of objects policies. May be you have missed something while applying the policy rules on AWS S3.