Like this, probably have to clean some of the rocks up too.
It's like magic...
It also good to tie shadows together, so here I tie her shadow to the shadow at the lower right corner, it directs your attention around the image and makes if feel more anchored.
The three big rocks on the left should be shaded on the opposite side they are now, and a few other minor tone issues (like the bright spot on the big rock in the lower right), that I will leave for you.
I think the biggest problem you have right now, besides the direction, is the falloff. Think like a beam of light, it doesn't get more dense the further from the light source, it radiates out and weakens as an inverse square, double the distance quarter the power (like gravity too). This is because it's spherical and the surface of a sphere is 4πr^2, basically inverse square happens because of the relation to volume and area of a sphere. But shadows are a phenomenon of light (or lack of light) so much like the light they tend to widen and dissipate over distances. I mention this because to do light effects (realistically) you have to know how light works.
There is a lot of geometry in light and shadow, I mean the Greeks basically calculated the circumference of earth just using shadows and geometry.
So with the one you have it seems to get narrower and maintains it's darkness even wen moving away from the source. The one I did is sort of like a cone with the point cut off at her feet. So there is some falloff to the sides, it doesn't lighten so much as it moves away, but this is because it blends into the shadows at the corner.
Just for reference
The rocks are a bit harder to fix, if I had the original of them without the vignette adding shading, I would vertically mirror the ones on the left and then patch the seam, that way their shadows would be on the left and not the right. But with that extra shading by the vignette effect, it would take more time then I care to spend.
Also the lettering looks a bit to "Fuzzy" for my taste...
Hope that helps.