If you want it to look real, here is what I did for this hand. I casted in bondo/resin. I used a little red cream hardener and mostly the white cream hardener. This gave me a flesh look to start with. I then sprayed the whole hand with burnt sienna and then steel wooled it off leaving it in the cracks and pores. I then toned it with a mixture of sahara tan and a few drops of red I believe. I guess you would have to experiment to get the colors you like. I then used candy paynes grey to paint in the veins. I added a few highlights of red on the knuckles and joints Lightly with the burnt sienna and sahara tan. Good luck!.
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