Sharing an image online involves more than uploading a file. Choose a version that looks clear at the intended size and decide what information should travel with it.
Prepare a deliberate sharing copy
Keep a master file separate, resize once for the destination and check the exported image after compression. Add a useful caption and creator credit where appropriate. Review embedded information if it includes details you do not intend to publish.
Before using any hosting service, read its current storage, access and rights terms. Keep your own copy of the photograph so that sharing is separate from preserving the only file.