for a school project i need to make an app that allows to create teachers, students, teacher's activities and student's evaluations. I have created a class Person that the classes Teacher and Student extends. But i have trouble learning how to correctly depict such a relationship in a Sequence Diagram. Only things i find online are for HTTP request but never inheritance.
I first need to create a teacher, then an activity linked to the teacher, then a student and then a student evaluation.
Should i make one big Sequence diagram containing everything or can i make several ones ? Please tell me what you think of my first 2 Sequence Diagrams Ever :

Since the logic to display Teachers/Activities/Students/Eval Lists are the same i think it would be wise to re-use the 2d diagram, any ideas how to ?

In short
Keep the diagrams as simple as possible but not more. Prefer several smaller and understandable diagrams rather than a huge and overly complex one that only you will be able to grasp.
More details
I understand that :
All these elements just reinforce the recommended practice of keeping diagrams as simple as possible.