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Hello Miro,
Lol, I can't stop laughing about the girl coming out through the window.
Anyways, back to important:
First of all, you need to show the client how your design will look from side, rear and front of the vehicle. Always is a good a continuing artwork.
Second, you need to activate the brand, not just placing the logo on a background.
Third, it's always better to follow the shape of the vehicle when you design, this will make both things, vehicle and design, look like thay are a same thing and not just a sticker on it. Right now it looks too striking.
The girl is really funny, but client probably would have thought you are making fun of him/her.
Finally, you are missing all contact information, this is very relevant.
I hope his can help.

Thanks, Ezequiel. I was dead serious when I was making this :-)) I just finished the second version, thank you very much for the help!