Step 1:

Open the Black and white image in GIMP. This is the image that I have used.

Step 2:

We need to select the hands using the Hand drawn region (F) like this.

Step 3:

Now go to Layers>Colors>Colorize and use the following settings there.

This is what I got after colourizing it

Step 4:

Similiarly now select the head and use the same steps to colorize it. This is what I got as the final result.

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