Involuntary accident, and now?

Hello guys, had an accident with my Astra F (bj. 97, 1,6 i) the day before yesterday. Luckily I had no fault and the situation has already been settled. The problem is now that my car got quite something on the front right (e.g. fender, bumper, hood, headlights, turn signals, fog lights). See picture!!! I was still yesterday at my workshop of trust and they thought that this was probably an economic total damage and I probably only had the time value of the Cars get minus the residual value. In clear terms, this means for me that I get only little money, for which I never get such a great and well-kept car. Now I will go to the expert on Monday and fear that I suffer a real loss, although I am not responsible for the accident. Maybe someone can tell me how such an expert calculates the value of my car (purchase price or selling price?). The car is well cared for, just TÜ V new, climate, 117000 Km, electric windows, mirrors, metallic, aluminum wheels, etc.)! Maybe someone also has experiences with this and can tell me if the reperature really exceeds the value of the car. MFG David