I can tell the work took a lot, but the sig isn't my cup of tea. :| the colored version is better imo.
V1 is great, the colors jump out at you, and yet somehow, it works just as well in black and white. Great job.
B/w IMO. Not bad, just that the colours on v1 are a little dull. I would say continue to work on this style. Add more details and texture and I think this style could look awesome.