https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13962849Edit ImageSaveSaveEditCropCustom TextExperiments in physiology. Facial expressions; FrowningOriginal public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 954 x 1200 px | 300 dpiLarge JPEG 2782 x 3500 px | 300 dpiBest Quality JPEG 2944 x 3704 px | 300 dpiFree DownloadExperiments in physiology. Facial expressions; FrowningMore