Renault Alpine A110 Plastic model in the diorama : Maiking small parts

I have just started to make small parts rather than building up a car itself.
After setting up engine case on the chassis, I tried to make some small parts which will be set on the roof carrier.
They could be a wood box, a brief case, gas tanks, water tank, fire extinguisher, tents. brackets etc...

Firstly, I made some of them.
Are they looked realistic ??