Hello. I'm a GIMP and general digital imagery newbie and I would like to ask you how do these brushes of yours work: are they like some addon for the GIMP application? Sorry for the newbie question. It's just I'm liking to use GIMP a lot both for creating stuff and retouching some important personal pictures I took in bad conditions or with poor devices, like an old Sony Ericsson mobile phone years ago with dim light, etc.