Wanna know a secret?
Sometimes there's no rhyme or reason for the things I do.
Case in point, when I retouched this picture and applied this brownish tint to the picture, I did not select a color. In fact I think this color was selected as a result of trying to even out skin tones from the previous image (strike that it was from this image). It is therefore a residual artifact (or a byproduct) from previous work. But upon applying the gradient map on this image, I liked the result and thus kept it.
Now you know how arbitrary my retouches can be :)