You will need the Hired Henchman mini and a black-haired mini of your choice. I used Clark Kent 009 Man of Steel. You will need a dark teal shade of paint. It may be beneficial to have black paint and peach (skin-colored) paint to clean up any defects that may come up in the process. Photos are in spoilers.
First take your Hired Henchman mini.
Next, remove the Thug's head. You'll have to make a bit of an angled cut to keep the collar of the jacket mostly intact.
Next, take your teal colored paint and add color to the upper torso sections on each side of the jacket.
Use the same color as above to paint the upper back of the jacket.
Carry this color over to the wrists of the jacket, making a thin line near the cuffs.
Next, use your chosen black-haired mini. Most straight-haired styles will work fine. Remove the figure's head, matching the type of cut done to remove the initial head.
Attach the head to the base Hired Henchman figure.
Clean up any paint issues you may have, touch up the paint on the neck if necessary, then you have your finished product.