Disappearing Act

I've noticed one of my recent photos keeps disappearing. It doesn't even show up on my updates. I'm not even sure if this miniature copy will remain without disappearing. My other two most recent ones also did this until recently. They appeared in my updates, so I'm not worried about them. As for the remaining photograph; I'm not so sure. I've been experiencing this problem for more than a week. Is there a limit as to how many photos you can post? It's really getting on my nerves. If anyone here has an idea as to why this continues to accure or knows how to solve it, I'd like to hear from you.