I wanted to comment the last colored image first but i can't go pass the girl by the mirror in the traditional drawings part... I can't say what is about it but it really stands out to me for some reason. Love it!
Now to the last girl. She looks pretty and surprised/interested (i guess that was your intention, so well done!). But she looks more doll-like than real. I think it might be due to the low contrast on her face... Your black and white paintings don't seem to have that issue so it might be something else.
But, if the contast is the problem, i think fixing it wouldn't be that time consuming in regards to it's effect.
I know that could be some sort of a tattoo on her forehead but if it is not, some shadow would make it stand out more. I think stronger or perhaps sharper shadows could be used on her eyes/eyelids and mouth.
The hair looks really fantastic! It is black and white (almost)... Maybe you should just be bolder when using colors-like you are in B&W.
Long but hopefuly helpful.