@Cristóbal Salazar Franchini, it's crucial that, if you're using remove.bg, you crop the source image before utilizing the tool. Otherwise, it'll be downscaled and the final cut will not be as sharp as the original source image, as can be clearly seen with the previous cut. When good sources are available, we want them to be used to their full potential as much as possible, after all 😉

Hello Mons, regarding this cut I had not found a high quality photo, in fact the one I worked on was already without background, however now searching more exhaustively I found the original source and of better quality. I also hadn't noticed that someone had already uploaded this one, there are times that I've been working with what I've reviewed until a certain date, and when I've uploaded the images I haven't checked if someone in that time will have uploaded a cut or reference image (at this moment of my university life I can't give myself that time as I would like :c).
Regards