Really nice, but ditch the white glowy -------circles. Coloured version looks best for me, very nice flow in it; Perhaps sharpen it a bit though because it looks a bit dull for being the gates of hell
Are the edges of the mirrored part supposed to be in there near the center? Looks good though good job.
V3 is the best, but i think i'd have really liked V1, just without the circles. or maybe V3 with a bit more of contrast? not sure. anyway, it's very very good imo