Ok buddy you made a great piece!
Just are few things, in my opinion you should work.
But firts lat me talk about the good points.
First of all a good choice for the model, and the motorcycle.
The clothes texture are good as well.
And the scenary is very well too, remember of her JLU adventures.
Now what you should work( just in my poor opinion
) is about the size, bigger would be really better, and you could work more on the shadonws, and ligths on her, and in the motorcycle, and put some shine on the motorcycle, to appears more to be a metal "skin".
Embraces, and keep fighting evil!!!!