Check these comparatives please

Hi. Please check these sentences with comparatives. There are a number of pictures on the sheet like a swimming pool and a yacht, and the students are asked to form comparatives. I realize some of the sentences with comparatives are awkward, if not incorrect. Thank you in advance.

1. The mansion is higher than the swimming pool.
2. The boom box is higher than the airplane.
3. The man is lighter than the ring.
4. The sports car is more exciting than the horse.
5. The yacht is more modern than the dinghy.
6. The mansion is more comfortable than the trailer.
7. The fur coat is bigger than the camera.