Q: transfer a photo from i-Photo to my i-Phone
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Dec 6, 2015 9:48 AMby FoxFifth,One way is to use iTunes to sync the photo(s): Sync photos from your computer to your iOS device using iTunes - Apple Support
One way that makes it easier in the future to add more photos is to set up an album in iPhoto and add the photos to that album and in iTunes select it as the album to be synced. The next time you want to add more, just add the photos to that same album and then sync again with the same settings.
Other methods include My Photo Stream FAQ - Apple Support, 3rd party apps such as https://photosync-app.com/, 3rd party cloud services such as Dropbox. If this is just a one-time thing for one photo, another option would be to email it to yourself.
