I don't know about you, but I think a human transforming into a vehicle would be pretty painful. :P
Great work on the lineart as well as the shading, working with such a huge size must have taken quite a while. I'm also impressed with the hair details, the lines don't crash into each other and each strand has it's own shading
The only thing that I can point out is the very small piece of shine on the right leg (her left).
I'm no expert on shading, but I think removing that small glimmer from an area that is currently dark would make the lighting match the rest of the light source.
Excellent work! :P