Since it is only a picture of appearance, this part of the technical features is not fully disclosed, so it is impossible to use the priority to file a follow-up application to solve this problem of incomplete disclosure. Of course, if it is the core part, it is the part to solve technical problems. Without this part, technical problems cannot be solved, and there is no hope for authorization (or it is meaningless to have a lucky authorization)
Then, as the agent said, you can consider partial priority or submit another application. If you want to keep it a secret, keep it a secret.