The cars are nice, but simple I could tell. They have different shape and design which is really cool but weird infront and a bit blocky. 1st car has very small windows in the sides. Try making the front design a bit more detailed. The ambulance is way different than the other vehicles, seems rushed. The front is very big and simple. You could really do more stuff if you gave more time and detail.
The plane is something different. I really like it’s design, awesome. I guess the front is like this so the engine could go there.
Try adding more detail and effort next time, although nice vehicles.
These were like my first cars ever made so that is why I didn’t include details the ambulance was a commission and he wanted an ambulance looking like this one.