Probably the easiest way to clean this up would be using GIMP, using the color selector, fine-tuning it to only the shade of blue of the background lines, and then using the eraser in a big size over it, or using the paint bucket, set to white. Then the image could be trimmed, desaturated (to make the lineart black) and then filled in with color. If the lineart was continuous and thick, the coloring could be done quickly using the paint buckets, but, if not, you could go a less convenient route and color within the lines using the paintbrush tool.
...at least, that's how I would do it, if I wanted to do it quickly. Usually, sketches submitted as part of Works-In-Progress submissions are farther along, but this is still functional.
"Sticky Spores carried by Fauna." should not have a period at the end.
I can provide more comments once this submission is more developed.