You got a really good piece with a nice original concept going on here. I really like the line play on the road and the background and scenery. Although, if I had to complain about anything, it'd be that BlackJack looks like she's getting a five o'clock shadow and her neck is weirdly long. And perspective wise, a bit like a dachshund.
Otherwise, you got a pretty interesting piece going here with a rather original concept. I'd just work on the proportions of BlackJack. If possible, it'd be wise to go in and try to shorten the body length, it appears a bit long with where everything is set up.
And that five o'clock shadow. I can't help but think someone just stole her coffee and she's pissed.