the most essential part of coloring line-art is being able to check up on the coloring
i really feel like you colored this and didn't even bother doing check-ups to find any missed pixels
i won't yell at you too much about the shading, but try not to let your lighting and shading cross so abruptly like you did around the chin. it looks gross.
shading is a learning experience, coloring in between the lines is not
good try