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Nailed it, first try.
(comicpress.socksandpuppets.com)
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Per the PHB: "Half-orcs exhibit a blend of orcish and human characteristics, and their appearance varies widely. Grayish skin tones and prominent teeth are the most common shared elements among these folk."
Grey is the most common skin tone tone, but browns and greens appear a lot in WotC art - There's plenty of official WotC key art showing green half-orcs in 5e. The DM of my game chose the appearance of this character, as she's an NPC - trust me, the art would have been a LOT easier for me if she were grey.
Here is official WotC art for a half-orc from 2017, it's one of the playable characters in Dragonfire.