Great job on those executioner guys. Those are fun sculpts. I love the bloody smock and the little details you added. Really makes the figures stand out.
The rhino dude is pretty cool too. You might consider applying some limited glazes to the skin. It would help break up the grey and make it a bit more lifelike. I'd try some blue and purple glazes. Maybe some blue or purple on the bags under the eyes, a hint of purple in cheeks, and maybe some reddish purple around the nostrils. Keep it subtle, you don't want to make him clown-like. But a slight shift in color can be nice.