This image was adapted from a picture posted to publicdomainq.net. All of the images on these sites are in the public domain i.e. CC0. This site is only in Japanese but can be easily navigated with Google Translate.
使用電話的商人
call、Comic characters、male、man、office、phone、publicdomainq.net、suit、telephone、tie、work
呼叫、漫畫人物、男、人、辦公室、電話、public domain Q.net、適合、電話、貼、工作
資料來源：openclipart ( https://openclipart.org/ )