I redistributed the different colors to different layers, 11 in total. I tried to distribute layers in such a way that one layer overlaps the other. When one layer wraps around another layer (hand/gun), it is harder to make the transitions smooth....
The layers as I have them now (1 is on top, 11 at bottom)
1 light blue areas of suit
2 the right side of the dark blue area of the suit
3 tie
4 right side of shirt
5 hair
6 face
7 the left side of the dark blue area of the suit
8 left side of shirt
9 fingers
10 gun
11 arms/hand, triggerfinger
as you can see the arm does not overlap anything, whereas the hair is not overlapped by anything (except a small part of the forehead perhaps)
suit partially finished.