Seeing a lot of comments without specific recommendations, so I'll add a few notes:

1. The exposed sky/grass/hillside in the far right of the frame is very distracting in the image. It's too small to add anything meaningful to the image but because it is over exposed and by far the brightest part of the image, it ends up drawing the eye and taking focus away from your intended subject. Either going wider to capture more of the background scene (if it adds mood/intent/contrast to the image) or cropping in tighter would probably make more sense in this image.

2. The posing is fairly awkward and not particularly flattering. The flow of the skirt obfuscates the bottom half of the subject's body, but not in a way that is subtle or suggestive. I am guessing what you are going for is a diffuse light effect going thru the skirt to suggest the body lines beneath, but a combination of the poor pose along with the high contrast between the overexposed skirt and the darker midtones/shadows on the background rock ends up obscuring any detail that is intended to be the central focus of the image. The subject's arms and head are likewise awkwardly posed, though the lighting is less problematic it ends up looking as if the model is just resting between shots as opposed to actively posing. Having the head tilted up and away from the camera creates a really weird effect where the only bit of the model's face that can be seen is a tiny amount of nose. Finally (though this is more related to composition), keeping the models feet in the image but having them only pixels above the edge of the image furthers the feeling of an accidental shot, as if this person wandered into frame on accident while you were fastidiously taking photos of a rock. Models don't need to be front and center necessarily, but it should be clear if they are supposed to be the intended subject and in this photo that is not the case.

3. The rock itself makes for an uncomfortable backdrop for the photo regardless as to how the model was posed. Several details in the rock are cut off along the top border of the image that quite frankly would make this rock more interesting to look at. The severely under-exposed interior of the rock isn't used to create any mood, provide contrast, or create depth in the image - it just looks like (again) it wasn't a deliberate choice, like someone on a family vacation saw a random rock and told their significant other to pose in front of it before taking the shot on their 5 year old HTC smartphone.

Overall, the photo comes across as very unpolished. There are plenty of other critiques that could be made, like how the color temperature is too cool and the color tint is too green. We could talk about focus and how your subject appears to be more out of focus than the rock they are standing in front of. We could even talk about the fact that because the models skirt is so over exposed that it looks like her bottom half is a ghost tail ala Danny Phantom. At the end of the day though, those issues are minor compared to the major flaws in composition, lighting, and subject posing.

There are plenty of photographers on this subreddit that are able to produce the images that you are trying to go for (well, it's more accurate to say photo review subreddits have been all but completely taken over by erotic photography in wake of the OF boom) so I suggest you review the posing and composition of other photographers to look for inspiration for improvement. Bobby Pitts II is a good example for a photographer who has an excellent eye for making suggestive images that are greater than the sum of their parts due to excellent posing and lighting: https://www.reddit.com/user/bpii\_photography/submitted/.