Depth of Field--photos

So, taking photos of these dinosaurs, showing different depths of fields. Here are 4 photos:

In this photo, I used a greater depth of field, and all the objects are in focus:

This photo shows only the closest subject in focus:

Here, although more difficult to do and it isn't as clear what is in focus, the 2nd subject is in focus, while the others aren't focused as well:

Finally, this photo shows only the furthest subject in focus: