I think the creases on the side (esp on the door) could definitely be reworked in terms of proportions. right now it awkwardly splits the side in to 3 slices of cheese. door handle is awkwardly positioned
The underside could use more shadow? not sure, but i would try since most of the weight is in the front now, unless you were trying for the front focus, back less in focus, but the back wheel is very defined, so i feel that the shadow should be as well.
dynamite sketch though