i can see that the trees at the back look kinda planted on the photo (and on her hat) and i think that the floor is too..
i'd say remove the trees completely, you don't really need them.
and for the floor- if you place the leg of the "horse" on the sand, it creates a shape around the foot- sand / dirt has softness. so i'd make the dent and make it in a way so it will look more believable, right now it looks a bit that the front part is stretched and the floor has texture but no volume. i'm only saying this because i find the image exceptional but the editing isn't good enough in comparison to the photography.