Points needs to be updated:
1) There is no text about building the model, explanation of the variables and identified feedbacks.
2) The whole stock and flow is just the representation of the system of equations. Since you have 12 variables, you also need 12 equations that will explain how these are calculated.
3) Add polarities to the stock and flow.
4) Show the results of the simulation.
5) Gap usually represents the difference between two variables.
As per the supervisor these points are hard to achieve since it is copied from the conference paper (https://www.researchgate.net/publication/317604945_Impacts_of_Safety_Performance_and_Culture_on_Work-Related_Accidents_A_System_Dynamics_Model),