Looks pretty good. Not too outstanding, but nice for your first try.
Maybe you could try to make the exocutioner's shadow a little more realistic to his shape. Also, try making the palettes have depth so it looks more like a 3d picture than a paper drawing.
I don't know if you want to do this, you don't have to, but you could try making the blood have a little depth too by changing some of the colors so it looks a little cooler, instead of a big red spill on the screen.