How does one achieve this effect

So I took this pic from Google btw sorry if the og poster sees this anyways how do I achieve this repaint and how do I do it with a brush if it's possible and if it isn't just tell me how they did it. Thanks

So I took this pic from Google btw sorry if the og poster sees this anyways how do I achieve this repaint and how do I do it with a brush if it's possible and if it isn't just tell me how they did it. Thanks