Thanks for reaching out. You may refer to this support website link to see how you can submit your photos. Also, check this article if you have questions, since you will need to sign up for this with the Google Art and Culture Institute.
Just checking in to make sure that you've seen my response. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.