I am thoroughly confused. If Usopp and Brooks weren't in this, I'd doubt it was even meant to be One Piece. Nami's missing her tattoo, and doesn't look right half the time, and there is no way that's even remotely Nico, other than eye color.
@PinkAya: Obviously the artist took some liberties. Or just had one eye closed the whole time, one of those. But that wouldn't explain why Brook came out decent...