So I'm kind of on a poster kick at the moment (I have 4 already sketched out)

This one isn't going to be inked. I want to play around with the texture of the paper & the pencil crayon.
But I'm toying with ideas for colour schemes -
Here's the options I'm debating between
a) Sepia
b) Greyscale
c) Greyscale with very faint colour (like those modified black & white photos)
d) Regular colour

Any opinions?