Smiling face neon green sticker https://www.rawpixel.com/image/7530356/smiling-face-neon-green-stickerView license
Stacked books clipart, stationery illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/6436495/vector-sticker-book-public-domainFree Vector from public domain license
Green book clipart, stationery illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/6436628/vector-sticker-book-public-domainFree Vector from public domain license