I took the liberty of changing the color pallet of your creation to make it perfectly match the actual album cover.

Your pixel art is flawless~ it's amazing work you've done there, and I give you kudos for such a great master piece.

The only problem you had with it, was that you were trying to color it with a pallet from Zero from Megaman Zero.  Which doesn't work in this case, because if you're as big a fan of the game as I am, you'd notice that the Zero from that MYTHOS album cover, is Ultimate Zero. (Zero with the Ultimate Form equipped from Megaman Zero 2 and so on, later known as Omega Zero).  His colors in that form are a bit duller and his hair almost white.  That's why I wanted to tweak it a bit.  I hope you approve of it.  And again, congratulations on an awesome pixel art.

http://i18.photobucket.com/albums/b107/Inuyasha_Zero/mythos_zero.jpg

Here's a bigger version if you wanna get a better look at it.

http://i18.photobucket.com/albums/b107/Inuyasha_Zero/mythos_zerox4.jpg