Why don't you post some in-progress photos so the people here can give you some tips in time for you to use them?
If you truly want to improve, all you need to do is ask if there's a better or different way to get the results before going too far. You obviously can see these things since you point them out on the finished models.
After all, there's no need to keep finishing models that you admit you wished had come out better when there's so much knowledge here ready to be shared.