But if you want something to improve on here.... [Warning Critic bellow!!!] Her shoulders are lined up with the wall. - I don't know if this is deliberate or not but that is something i would have changed if i was the artist of this piece..... Mostly because i have read several tutorials and one of them said to never do that [line up things in your image.] But if it was on purpose just ignore this section of text cause i really don't know what i am talking about. Sorry if you didn't want critiques on your work. - i have got told off for randomly critiquing before... - but ummm. I just try would just use it to improve it someone critiqued me... [im crap..] Im babbling.
The colours of the trees and the grass and the background could use a bit of harmonising. Like a couple of low opacity gradients on the edge of the image to bring it together. That wouldn't take away from that it's separate just create a subtle link in the sections of your background and make it clash less. Again i don't know if this was deliberate or not so just ignore it if you did it on purpose.
I hope this helps you to become the amazing artist you want to be
Really nice image, the scenery is especially pretty. The is one small thing I think could make this even better- if you lowered the wall a *tiny* bit. Right now it is pretty much dead center dividing your painting and how it lines up with the shoulders sort of makes the girl look decapitated at first glace. I think by fixing that tangent either by tilting it slightly or lowering it could help. I hope you don't mind the small critique, overall the whole image is very nice and has excellent detail!