the coloring is very good, and the alignment and number of individual drawings of the initial character is very good. the impact of the color was so great, and the gradient complements the drawings. also, the background seemingly went together with the drawing, but the technique is (kind of) off, but it is good enough. also, you may try to scatter the shadows, not on one side only--> referring to the gray suited one, and i think you should make the facial expressions more distinct, so it can give more impact.
oh, and you forgot to put your name; some might claim it as their own work, be careful.