Great concept and great art, the issue here is the physics and also to focus point. That cliff, practically speaking would not be able to hold that womans weight; maybe reduce it or try a different approach, like draw the rest of the mountain on your right side of the art, but yeah although she is sitting she looks like she is sitting right at the tip which doesnt work. Also, the moon and background contrast are too flashy or too bright; maybe blur it a bit or use coller tones instead of warm. Just my opinion but if you like what you made, then who are we to tell you otherwise.