How can I color the specific region of the image?

Hi!

My dear seniors and experts,

I want to change the color of specific region in an image. The background color should be different from the eyes color of the image shown below. Please help me in this regard. Thanks

 img = imread('C:\Users\Junaid Khan\Desktop\jun.png');
bn=im2bw(img);
imshow(bn)
bn=bwareaopen(bn,100);
imshow(bn)
[L,n]=bwlabel(bn);
imshow(label2rgb(L));
prop=regionprops(L);

The above is the input image and while I run this code the output is like this.

I want to change the eyes and mouth color and also the background color should not be same.

Thanks