I like your painting. Great smooth grey scale values an fantastic brushstroke of her hairs. Maybe you could reduce a little bit of the brightness of her hairs.

I like the variety of brushstrokes in this image. What appeals to me the most is the texture of the hair in contrast with the softness of the face. Although, If you're aiming for something a little more photorealistic, you could try defining more of the hair at the back of the head.

This looks awesome, and I think there's a pretty interesting contrast happening between the refined face and the rougher brushwork in the hair.