Crits on the compposition;
Large uneven negative space, not good especially with the type of peice.
No dynamic-ness, the visual signposts are too small and close together, so you dont focus on the actual scene just the smaller triangle.
Light, as good as a spot light is for focus, theres no ambient light as you would expect from ti being outside. Maybe some subtle background or even a foreground.
Persective, its unoriginal and boring. Needs to have a kick behind it to lead the viewer better. Try framing the image with again, a little foreground or background so your eyes are lead around the image.
Just so you know, always work in 3. One centre peice, two supports. Light casting off another object matbe the knife wedged into the tree with blood dripping down it type deal. spread out the focal points a little so you can lead the viewer better.
Right now it seems like im just ripping in to your work, but im not, well i am, but because you could really make this peice shine and i jsut wanted to part on some advice
Hope i helped anyway