The whole thing hasn't been treated as pixelart. It feels more like a traced picture which got filled with a paintbucket, and then got simple shadows.
But leaving that aside, I don't think the hat band thing is the part that has more problems.
Cel-shaded? Alright, but what's up with all that zigzag stuff? I mean, I googled up for Alucard, and indeed the original has something like that, but in yours it isn't working to show volume, they look like they are there just because. The light sources on your picture feel rather random, and the color choices aren't the best, not to mention that you are not using them wisely so far. (That dark red could be used to smooth out the black for example.)
Overall it could use more AA if you are going for that flat coloring, looks really jaggy.
If you are working that big, you should put all the effort needed so it doesn't look half assed.