Well you are showing us more the crown area in the photo "one year after hair transplant", while the clinic did not implant grafts on the crown.
Most grafts had been implanted implanted in the frontal area which has been changed a lot and it has good growth, and less grafts had been implanted in the midscalp thats why it looks less dense than the frontal part. You did not have hairline before, but you have now and the frontal area is quite good, while it was really bad before the procedure.
With the photo you uploaded now we cant see the result in the frontal area, where the most grafts had been implanted.
If you comb your hair backwards it will look like this and it will show difference with the pre op pics. In general yes it could be better than the result you got, but you are a norwood 6 and you need 9000 grafts for full coverage since you have a huge area to cover.