I plan to store images on Amazon S3 how to retrieve from Amazon S3 :
1)file size 2)image height 3)image width ?
You can store image dimensions in user-defined metadata when uploading your images and later read this data using REST API.
Refer to this page for more information about user-defined metadata: http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html