I am sure it must be so frustrating for them when we don't take notice. I know I try to debunk things first because there is nothing worse than thinking your loved one is "checking in," and it turns out to be your cat!LOL
I will let you know if this happens again, but I usually see something on a weekly basis. In fact after my mother passed I used to look at one picture of her and it was like she was illuminated and smiling at me in a very cheeky way, like the cat that swallowed the canary. That is why I was surprised I was starting to see something in my husband's picture. ( I thought, oh no I really am going bonkers.)
I know my husband would do anything in his power to get my attention. In fact the evening after he passed I was getting ready for bed and standing in front of the mirror, I "sensed" he was standing behind me wearing the cool disco clothes he wore when we were dating and he was very happy. (But, I was kind of drunk) because that was the only way I could even process that my husband was gone.
Thanks for your help!