Analysing the monkeys in that artwork, this one is obvs the white faced capuchin that we have...
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...these ones are a little harder to identify. I don't think they're spider monkeys or another capuchin because their tails are too straight. Spider monkeys and capuchins have tapered tails that are quite thick at the base, and spider monkey's limbs are characteristically extra long with defined thighs and shoulders.
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The monkeys in this artwork have quite round faces and grey-brown colouration with slightly darker faces. I can't find an exact match in SA species but as
@Marvinb pointed out, there are some SE Asian / tropical pack pieces in this artwork, so it might not be a latin monkey. My guess if it was a SA monkey would be a muriqui:
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