I think the rougher inks look nicer over the digital ones, have a bit more of that hand-drawn quality that's lost when you ink. As for colors, right now, your black and white definitely looks better than the color. However, I think there's potential for your stuff to look okay colored. Right now you have very had-drawn and simple line art, but you're pairing it with very scattered and bright colors. Right now you have very very saturated colors, the kind that don't really exist in nature, and you have red, blue, green, yellow, purple, blue.... all the colors pretty much. IF you want to color, I'd suggest making your colors less saturated, and limiting your palette to a specific color scheme rather than picking all the colors. Stick to analogous or complementary, don't go for triadic or quatradic.
Here's three color schemes (not within the lines very well) that are examples of what I'm talking about:
Complimentary (mostly purple, with yellows as the accent/contrast)
You can still have a color scheme that comes off as bright, but this only has a total of 7 colors, and they're all purple or yellow, and none of them are saturated 100%!
Monochrome, full contrast:
this covers a range of light and dark (full black in the lines, dark grey to pure white in color) but in a single color.
Monochrome, accent:
Mostly white, still giving that paper color, but with just a hint of light blue to indicate shadow or darker objects. This helps maintain that paper-feel, more like you took that ink drawing on a piece of paper and just colored it in with a highlighter a little.
Depending on what mood you want, any of these can work. I still think you could stick with black and white though!