Nice stuff.
However, there's something that you should keep in mind.
- She's apparently on a higher ground compared to the river. Is that intentional? If it does, then you might want to consider adding a path or a pile of rocks to help the viewer to imagine how she gets there.
- Its unclear on what the bag leans on. Rocks, trees?
- The closer the it is to the camera, the more the colors get saturated. It goes otherwise on things far to the horizon.
- The horizon line is wrong, you might want to bring the horizon line on the same level as her eyes. Its evident since we can see the upper part of her thighs and shoulders. If you do, then you might want to extend the background a little bit more.
- You might want to get a custom brush for the leaves, since doing it one by one can be a pain in the arse. If you're willing to do so, then by all means.
That's my two cents. I'll comment more when its done. Oh by the way, you might want to add a brighter lightsource. Remember, sunlight is yellow, not white.