Heh I was just talking to @wardred about his helicopter in the cubicity discord channel. Both your motorcycle and helicopter look really good! I’ll give the same feedback to you that I gave to wardred: The vehicles in cubicity are a great time to play with proportions.
Right now your motorcycle and helicopter feel a bit like low-poly versions of their real-world counterparts. This is fine but I really like the aesthetic that comes with shrinking wheels (if the vehicle has wheels) and making the cab abnormally tall. As you’ve done with the cab in the background.
Maybe you could try shrinking the motorcycle wheels to see how that feels. Though this approach may not apply well to the motorcyle since it’s so small. For the copter I’d try shrinking the propeller to be small; like silly small. Sane with the legs and maybe tail.
