If I may, lighting. As your image now stands, the background terrain is almost equal in visual strength to the figure: a few isolated spotlights fixed on the character and softening the universal lights on the image overall will dramatically increase the sense of mystery. Is your sky an imported image? If so, may I recommend heightening the contrast in it before you import? Push your blacks to as full a black as possible, and heighten the saturation of your midtones. At the risk of sounding forward, I think you'll find the difference remarkable.