Adding a new light source

now i am going to add some new light source to the drawing, at first i tried some yellow but that was almost similar to the gold colors that i am trying to use.
then i used some red, in that exact pattern, but the face color is on the red side, its not red but its like on the red color palette.
so, i am thinking of going with blue or a bit of green. since i colored the eyes with blue, i thought some similarity will be good for this.
i intend to add some layer modes and we will see how that works out.
For now, blue seems to be adding a good and bright contrast into the drawing