Upload & Sell: Off
First...my standard intro to anyone "new" to me on this forum...
My comments or suggestions below are not a criticism of you, your model, your talent or skill. I offer them in a friendly tone of voice and with the sole intent to help you with a second POV and set of eyes. If you read sincere questions and simple suggestions as "criticism" of you, then you will miss how I am trying to help you.
Of course this may be your own "style" or your own "vision" and I suppose we can assume that the images look just like they do because that is exactly how you like them. That is OK too. It just shows that there are differences of "opinion" on what looks good. IF these are exactly what you want and like, then by all means continue making your images look like that and have fun doing it. I can only speak for myself and what I do or do not find appealing in the posted photos. As I always say: "Follow your own muse."
A few Quick Comments:
She is pretty. That always helps a photo.
In general, these are nice photos and I would guess the young girl would like them.
First thing I noticed (or grabbed my eye) in a few pics is the lighter skin tone halo or "ring around the lips." Odd and distracting.
Also, a couple of these do seem to have a "pursed lips" pout lip expression (often tried by young girls...for some odd reason).
I think the choice of a black hat with a black background AND your lighting was a poor choice.
From this set, my favorite is the last image because it appears more "natural" in expression and shows her facial beauty best (skin, eyes, shape). That said, I believe it is framed too tightly (I would prefer to see more head/hair/space).