He is not a natural goal scorer, but natural goal scorers seem to settle for that and not really improve throughout his career. He always give 100% and will continue to learn until he is great. I believe he is the type of player who will not suddenly stop improving, he will continue to improve until he becomes one of the best English forwards (like Harry Kane has), or gets injured and never makes it as far as he could.
We have to not forget, he has just won the U20 world cup, scoring goals, and is our best forward already at the age of 20.