I know someone that is very good with color, and she makes me want to try to do more color! I should link you to her, she has pencil without color, and then she colors it, and it looks really cool! But black and white is good too, but maybe you could work on darkening some areas more and showing more contrast and shading, that makes up for the lack of color. Otherwise the pencils look like they are waiting for ink and color. Just a suggestion, I hope you give it a try! Let me know if you want me to show more what I mean.
[link] here she is, look at the colors and shading! Her colors make me happy! Also she just tried a realistic drawing recently, her first try. If she has some uncolored work compare to colored. I think your pencils work is great, but I would make more contrast and shade more in the dark areas, etc..