If this question is about making a watermark with GIMP, then yes! It is possible to leave a watermark with the help of GIMP, but we would recommend not using GIMP if you want to leave a watermark using graphics other than text. This is because you can leave a watermark using text but not anything else. So, if you want your brand to become recognized by the public, it is better to use some other tool. Like; iMyFone MarkGo.