Reset/change Emoji color for human features

I inadvertently hit the wrong color for a human emoji. Holding it down does nothing and I really need this particular emoji to be correct.

You need to long press on the emoji for which you want to change the skin tone, this will show a skin tone picker.

You can do this on macOS in the Emoji &Symbols picker, and on iOS using the Emoji keyboard.

Skin tone settings are saved per-emoji.

If long press doesn't bring up the picker, you have a different problem.

Recommend a website Emojizoo | copy and paste emojis by one-click

where you can select the different tones you need. And you can also search emojis by meanings.