It’s really good for your first go! Some improvements are to add shading to the face, basically like you’re putting makeup on the drawing (contour, highlight etc) it helps to add depth to it. Also it’s a personal preference but I personally always remove my sketch from the final piece but if you want to leave it in make sure the lines are crisp and continuous! For the hair don’t be afraid to go outside of the base colour as hair will always have a few flyaways. Keep doing what your doing and you’ll improve in no time! 
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