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URI is the URL which points to JSON data containing name, description & image for this NFT. This JSON data is also known as "metadata" & it should at least have at least these 3 properties to correctly show the image in your wallet (Metamask or any other wallet). Also, I uploaded the JSON metadata file for this NFT on https://web3.storage which is a decentralized file system to store & host your uploaded files (see the video below for your "how to's"). You can choose a centralized service or even host it yourself but what's the point of all this if you want to use centralized servers in the end to host the metadata. Notice when looking at the JSON pasted, I used the image which seems to be coming from a web server & you're correct, which I can justify by saying, "Yeah... 👀" but you would want to host the image on it or any other IPFS 😬.