both pages look really great!
heart i'd say stick with the grayscale (and use black to replace the blood in the colored version, because in the grayscale you're right that it's really not clear) for a few of reasons:
first, it's the manga style, comics are black and white, covers are in color.
second, it's less work in the long run - indie comics burn out more often than not, so if you're working on something you want to keep doing, you should keep a manageable workload.
third, the colors aren't SOO great that they seem necessary, the work is excellent in grayscale anyway, so do you need color? no. maybe it's because it's a dark scene, the only colors really seem to be blues and reds. a better comparison would be a well lit scene with multiple characters or a table full of food, or other variations of color.
the color work is fine, it's adequate, but it's not a scene that shows off your best color work.
heart