Nice work! I like the colors and the pose, although the advice I could give you for the shadows is trying to add some purple in your shadings :3 Especially on the skin, it tends to give more depth to the colors ;3
Here are some examples:
https://www.newgrounds.com/art/view/moonmew/feelin-lazy
https://www.newgrounds.com/art/view/moonmew/cowboy-adric-request
(sorry for linking works of mine, it was way quicker and easier than looking for examples and I'm kind of a lazy human beeing...)