The #GtkImage widget displays an image. Various kinds of object can be displayed as an image; most typically, you would load a #GdkPixbuf ("pixel buffer") from a file, and then display that. There’s a convenience function to do this, gtk.image.Image.newFromFile, used as follows:
Fluent builder for gtk.image.Image
Fluent builder implementation template for gtk.image.Image
Module for Image class