One works, the other doesn't

Hello! I had submitted two photos to add to Pokestops. Both were accepted! Thank you! One (Domains) now appears as an option to pick that photo as your "gift" picture, but the other one (Alden Library) is not an option to choose as the picture for your gift, even though I have "thumbs up'd" it and removed the thumb on the other picture. It's been several months. Can you tell me how long this will take?
Thanks!
Kim
Comments
For photos, it’s possible for old 👍 from Ingress to affect which photo appears.
So even though you’ve removed your 👍 and assigned it to your own one, there may be some Ingress ones from a while back keeping it from being the “best” photo.
Get more thumbs up in place. You can do this by send gifts clicking through on the postcard allows you to reach the photos and give it a thumbs up. Sending these to friends with instructions should hopefully enable enough to be in place to enable the photo to be used.