Knight

Though I am not a professional I have noticed some things off.

Pose:
Her pose seems to be a bit unnatural. For the armor she is wearing she should be more upright. A dignified stance. I strongly feel her left hand should be seen at her side around her waist or stomach. Hands firm yet delicate. The uncertainty in her face is fine. She seems caught off guard.

Color:
I don't know if you going for this look, but she seems dry. Here hair needs a bit more warmth. Red, but a hint of an orange color. I sense that the white in her hair is to be reflection from the sun, but to me it comes off as grey hair.

Texture:
I am not sure if her armor is suppose to be metal or bone. The color and roughness of the stroke on it gives me the impression of bone. If you were working for metal use a more darker gray that is still slightly light. If the red cloth on her is suppose to be worn due to war then all is well. If not and it is suppose to be soft and flowing the strokes need to be together and not sticking out. The same applies for the things holding her hair up.

I hope this helped. I tried to be as thorough as possible.