Medieval Keep

This is a Medieval Keep I built on a survival server. I have not done the interior but I I have finished the castle itself. Some feedback on how I could improve it would be much appreciated. ^-^

EDIT: I forgot to mention but this design was made by Jeracraft. He's an amazing builder and built this completely on his own. I do not claim to be the one who built this but instead I wish to have feed back on how I can improve someone else's build.. You can check out his channel here.