This photo is a good example of depth of field because of how the statue is in focus instead of the leaves which are framing it. The photos main focus is on one thing instead of just everything in the photo.
This photo is a good example of perspective because of how the path starts to diminish as it gets farther away from the beginning of the path.
Excellent. Just remember that depth of field can be shallow or extensive. So your top example is a great one for shallow depth of field.