First Click on the problem photo. Scroll down to where it says Title with a box and change the title to the correct name. This is so folks won't mistake it for someone else.
You could attach the photo to your profile temporarily until you create the profile for the right person, or create the correct profile and switch the ID.
To change a picture to another profile:
On the image edit page: Find Add person or free-space profile: Type in the new Wikitree-ID (your's is Gaddy-237, Alvin's is Tweedy-132.) Save. Then you can go back to the edit and click on the button REMOVE from image in front of Alvin Tweedy and save. Just make sure you have the photo attached to someone else before you remove it from Alvin.