Do you see any incoming views using Keyword “Nobody”?

Yes you could but it is easier (to my mind) to use Bulk Editing.

Select all the images on the page (you can go up to 100) and then deselect those with people in them. (Or if you have lots with people go though selecting, whichever is quicker)

Then in the Bulk Actions dropdown select Edit and Apply
Then add the word you want to add in the Image Keywords box and Apply

If it times out (it will take quite a while) then try again with less images on the page

it’s personal preference — I use the premium batch edit — do an initial select , eg ‘landscape’, up to several hundred, then highlight what you want to change, then add keyword or category

I don’t use ‘image’, stock’, etc as keywords — as keywording everything gives no real information, and users searching on site already know they’re looking for images (‘illustration’ or ‘vector’ may be a different case); google already knows these are images, so the extra keyword likely doesn’t add anything