One of the few draws that bother me is Roger; in one panel he is Ace's twin brother, then he changes to Shanks and then he is a mix between Luffy and Roger.
Since summons started and we know Shank was from a royal familiy I always had the assumption that the reason Shanks lost his arm was becuase he has a mark that linked him to Imu. GG Oda
This image corresponds to a robot from the anime 'Tenkū no Shiro Laputa'. A work known for being an inspiration for Oda in the creation of One Piece and from which many references and similarities come out