I honestly really like this; (excuse me this is my first critique aha)
You've positioned her with a very cheeky posture which says a lot about her personality- which I like, I can tell she is a tomboy from the choice of clothes you've given her! It's however, not overdoing the tomboy aspect of it (such as putting them in overly baggy clothing).
The style is sweet and simplistic which makes it definitely a good character to reuse for later works!
I really like your colour palette, nothing is too flashy or too pastel or too dark its very pleasing to the eye.
Overall, though cartoons aren't really my thing- I do like this a lot.