I like the singer the best (got 7.5 from me) (and the warlock the least). I think the bone structure would win if you give it several washes with flesh wash or well diluted brown ink, otherwise it is too flat.
The cape might win from a sharper contrast as well, but it is again a matter of prefference.
Blending transitions are too sharp in places (shoulderpads, backview; cape, backview)