Your Challenge was to take two photos of the same subject such that the subject is the same size in both photos. And to use the extreme ends of your lens focal length range - very wide and telephoto.
Here are two photos of Wilberforce taken at focal lengths of 18mm and 300mm. Can you spot the difference?
At 18mm there is far more in the shot. The field of view is much narrower with the 300mm. In the 18mm photo, look just to the left of Wilber's hand to the far bank of the lake - see the darker bush? That tiny dark area would be the dark area behind Wilber on the 300mm image.
The 300mm blurs the background a lot more. Both photos were taken at f5.6, but the wider the lens, the more in-focus the background is likely to be.
Looking at the dark bush on the far bank again, in the 300mm image it seems a lot closer. Telephoto lenses compress distances. Conversely, in the 18mm the bust seems very far away.
Wilber looks a bit more portly and distorted in the 18mm photo. This ties is with the above where a longer focal length will flatten out features.
What you don't see is where I needed to be to take these two photos. With the 18mm lens, I was literally lying across the table to be able to get about 20cm in front of Wilber. When I had the 300mm lens on the camera, I was about 8m away, on the other side of a gate.
So next time you are taking a photo of someone in front of a famous landmark, instead of using a wide focal length, try using a much longer one. Okay, you will need to place yourself much further back, away from your subject, but you will then have the opportunity to have the landmark feature more prominently in your image.