Great work! How much photoshop painting have you done? Because if you're new to this you're doing very well! I can tell you took a lot of reference from the painting tutorial I did, even to the point of using a similar character look, applying rim-lighting, and clipping masks. You've done a great job! Next assignment: Try a full body character in a dramatic pose! get into the spirit of challenging yourself and trying new things. You might not be 100% happy with the results at first but over time you'll be glad you did!