Neat little animation you have there, the swings are very flashy with the wind/sparks coming off, it look very well done. But the sword is gray and very hard to see. Lighter shade? Slightly blue?
As for the other picture, I think you need another color in there for the moon, etc, it doesn't blend into the black very well. Maybe that's intended? I don't know.
The water looks very nice, but it looks like she just rose up from the water, or blood is dripping into it, and it looks very peaceful, not stirred up at all. So I think you need a depression, or some circular waves. Also, the color is weird, shouldn't it be red? Or possibly splotches of red blood in it? Also, the shadow is good, but technically wrong, the shadow would be very stretched if a light source was right behind someone.
I personally recommend trying to put in fog, I think it would look very nice.
Other than that, it looks very nice and stylistic.