not bad
I love the soft delicate feel of this character. Great costume too. However, don't be afraid to add more contrast. Without it , the illustration lacks a sense of depth, a big no no if you want to show this for a portfolio review.
Also, try challenging yourself by drawing things that you're not comfortable drawing. A great exercise for you would be to practice drawing bikes and lots of them. That will definitely help you boost your soft and delicate style to new heights.