after further review i think your photos are headed in the right direction but with some minor tweaks can be a lot better.
some things to try:
1. the lighting is too harsh. try shooting around sun up or sunset for the softest light with the best tones, it makes a world of difference.
2.cropping (or lack thereof) can change a picture completely. take this one for example:
I would crop it like this:
in general i would say you leave too much space, especially over her head. empty space imparts a feeling of loneliness and it loses impact as the eye wanders.
here's another example:
vs
I hope that's helpful.