While the coloring of the piece is good, the proportions are a bit off, I suggest breaking the figure up into shapes. Some of the more obvious fixes would be to make the legs longer, the arms shorter, make her torso a little longer, her right

hand is backwards, and her feet are two different sizes. While that is a lot to focus on, proportions are generalized and are one step of improvement, if you want there are some tutorials that exist to help. Some artist I suggest you

watch to help would be Jim lee and Mikey mega milk, they have great tutorials.