Four Butterflies on Flowers (1747–1802) painting in high resolution by Paulus Knogh. https://www.rawpixel.com/image/7726612/image-flowers-art-public-domainFree Image from public domain licenseTwee vlinders (1747–1802) painting in high resolution by Paulus Knogh. https://www.rawpixel.com/image/7726598/image-art-public-domain-paintingsFree Image from public domain licenseTwee vlinders bij een lelie (1747–1802) painting in high resolution by Paulus Knogh. https://www.rawpixel.com/image/7726602/image-flowers-art-public-domainFree Image from public domain license