Portrait painting with waterlike acrylic color

Hello everyone, this is my third portrait drawing in this method. I am using proper white color as the highlights at the end. Even though its not looking great, i am really happy with the eyes....
Like the others, this one also took half a day. I could have waited and made the hair more dark but i thought that this is enough.

Let me know your thoughts about this drawing.

Here are some process shots:

Reference image used for this drawing.