I like the idea of making an adventure game from a comic, once I was also thinking about this, but I found it a bit too big work

For your question: I think it is ok if it's black and white if this way you can express the story well. But I guess if you did the comic in black and white than this is not a problem. (Many people liked the Sin City movie: why woudln't they like a black and white adventure game?)
I agree with Mystery in that it should be interactive enough, and not just an easy click-through game. I guess this is similar to interactive movie adventure games. I like those very much, so I am willing to play with your game as soon as it is finished. I think a Max Payne-like narrative style would be nice.