For sure, always keep trying! Practice makes perfect. Practice Practice Practice! you've got the eyes down for sure, maybe if you put a few solid lines into the hair this will enhance the hair and brig out the face. youtube also has tons of tutorrals on shading, definatley check them out to give your work some depth.
You got the talent, emotion, and skill, so don't give up, this is a wonderful hobby to have and if you enjoy it you should keep at this.