Edit: I’m gonna texture it in blender.
tyou have set smooth set on for most of it.
this is not always a good idea for some things e.g the seat looks strange because of it.
and the central part of the wheels.
just a hint only put set smooth on for the nessesary parts. model with more details/curveing at the first stage. or use clarck subdivision for some parts of it.
othher than that the model is nice
Actually rather than setting smooth part of your meshes it is a nice idea to set smooth ALL of the mesh and then push the ‘AutoSmooth’ button, which makes sharp any edge sharper than a given angle…
P.S. Too low poly here and there, IMHO