I am not really good at these but I will give it a go, the only thing that I could possible see that might be wrong is the line for hair and the cape don't match the line of action for the piece I think but that is just my opinion, but as a piece it is rather good as the skin tone, shadows and highlights, and over all feel of the piece work.

As I stated at the start of the critique I am not really very good as far as these things go but I hope you appreaciate my opinion and sorry about any spelling mistakes