Your design is cool, and I especially love the way you did the shading where the hair is covering half of their face. Your line work is pretty solid as well, and you have a good grasp of shading.
I think at this point it’s just a matter of experimenting with your style and making specific choices for how you want to do things. Right now it looks a little bit like a “generic young artist’s style”, so what are some ways you can change things up and put more intention into stylistic choices, so that you can distinguish yourself more and grab more people’s attention?