What are the rules in Islam about keeping photos, children's drawings, or paintings?

I'm having trouble finding consistent information. I have many family photos, drawings that my young brother made for me (scenery, robots fighting, and two of me ) and some that the kids I teach have drawn for me. I also have two paintings that my father made. One is abstract (colors and shapes, no image of a specific thing) and the other is partially abstract but has a person facing away and reaching out (you can see part of the back, the back of the head, and one arm). My take has always been that I do not worship these images, so it's not a problem, but recently I've been told that ANY image (incl. photos) of ANYTHING is forbidden to hang on the walls (the paintings can not be put away, they are too large) and that photos and pictures of LIVING THINGS are forbidden to be kept even in albums or boxes. These things are precious to me. I don't worship them. They have emotional significance and I'd prefer to keep them as they are, if possible, but if this is wrong I need to know.