While a blockchain can cryptographically prove which address a token belongs to, if this token represents a digital image then it is likely the file displayed is stored on a server that may not have/keep having the data availability of a mature, socially distributed blockchain.

To prevent losing this image due to unforeseen reasons the simplest way would just be to right-click + save to your computer. Another way would be to also setup an IPFS node and pin the images.

To do this:

1. Download and Install IPFS Here
2. Initialize IPFS and run the daemon with This
3. Once your daemon is running use the Web Console at the webui url to upload your files
4. Pin these files to your local node