You answer:

Hi! Yes, you can print some posters and put them on the walls as an additional reminder - I did it and it worked perfectly. I chose the size of a regular poster so they wouldn't be too big or small and asked this company for help. Go to their website and check out the services they provide, I think you should find something there for you. They also have very high quality printing. This would be a great gift for your girlfriend if you just printed the photos of you two!