Welcome to Gaia! ::

i wanna start out by saying this is an awesome piece and its very good.

as for the highlights its can be tough determining how light color effects different colored objects. but for this piece its obvious shes being hit by a cool colored light source so i'd try to add light hues of blue to the areas effected by the highlight.

as for the wrinkles and creases in the clothes i would think about scaling it back some. i feel that you may gave gone a little overboard with it. i think a less is more would work a lot better in this situation

also the hair around her neck doesn't seem to have the same attention to detail as the rest of her hair if you're just not there yet never mind this XD

lastly it might be a little late for this but be mindful of your hands. but the hand with the white owl in it looks slightly small. and the pink is slightly long. normally the middle segment is shorter then the base and pinky's are normally shorter then the ring finger. but you did do an excellent job on the other hand.

but this is an incredible piece and i really like the face and expression
i wish i was better at rendering pieces myself