Terribly unhelpful pictures
Duolingo has photos that a course contributor can choose from. The pictures are tagged in some way so that one can search through them.
Unfortunately, this old system has a number of disadvantages. Some words lack any suitable pictures at all. Other words use similar pictures or pictures that are not much help (however, can you explain how a real-life father is so different from a grandfather or a man in general?)
Also, you cannot chooose the pictures you want. There is a number of photos for each concept, and you can not remove those you do not think fit the word you attach them to. Then there is an issue of all photos being off: for instance, all pictures for "box" are various postboxes. None of them feature a cardboard box.