Good, but needs a lot more on the background...
Right, the best thing that I can advise here is to spend time creating your own background. This looks like you putting the character onto a photoshopped scene, including the rock itself here. That either means a great level of detail in your drawing of the rock, or just that you've not reduced the quality enough from you tracing or similar. The clouds look like a photograph and the effect of having them next to a cartoon looks poor, if I'm honest. Try something other than just an Ocean / Sky background. Have you considered adding something like beach in the foreground, for instance?
Turning to the character herself, you've done a decent job there, with the feminine curves, the smile, the red hair and the horns. Applying a subtle cheat, by covering the feet in shoes and hiding the hands behind the hair and rock was a nice way of getting out of potentially "tricky " detail situations, but we'll let it slide. The pose was decent, but no-one sits down perfectly, so a little detail, where the underside of her right thigh gets pushed in by the top of her left, as they cross over would be nice, as would be the attention to where the shading should be. Looking at various other shadows, I would say somewhere around the top-left of shot, therefore more of a shadow should be cast by the upper leg.
Attention to detail is what will get you more stars, so keep working on it.
Finally, your signature is a little colourful to blend in to the piece, particularly with the shading as it is. Perhaps consider layering it on top of the piece in post-production, as opposed to putting it on the rock itself, as you have. If you're going to leave it on the rocks, perhaps change the colour and don't shade it so much...
[Review Request Club]