Castlevania!

[PrettyNier]

The only thing I can suggest is to try and get rid of the black outline around the sprites; it has a negative effect on the depth of the sprite and it's always bothered me that they put those on in the later games. Alucard from Symphony didn't have one (it was a transparent layer, so the outline that you see from that sprite sheet was normally invisible, except during spell effects like Dark Metamorphosis) and Juste only had a bright blue one because of the readability issues the Gameboy Advance had.

Similarly, while the shading is pretty good for the most part and the colors aren't offensively bad, they could stand to be more interesting; in addition to removing the outline it might help to increase the contrast between shades and shift the hues a little bit more to create more interesting combinations.

Also, don't ever use neutral gray in combination with saturated colors. Tint the gray tones to something colored.

this is good. restrain the front arms movement a little bit more, or increase the movement from the back arm slightly and it'll be even better.