One problem that I used to have is to hide two main windows such as Toolbox-Tool Options Layer Brushes, that make my GIMP seems with no accessible icons on it.
Go to Windows -> Dockable Dialogs to have them back:
After cutting the edges of the original picture using sicssors select tools:
I added another layer with a full black rectangle Edit – Fill FGBlack Color
As well as another horizontal rectangle and I used Text tool to add words:
To set in black and white, Colors – Components – Channel Mixer
Check the Monochrome option. To color, I selected Color – Colorize
Blur the edge of my hair gave a nice look at the end.
Last and not least, I added another layer to the GNOME logo to put it inside my eye 😉
* Zoom out was done with SHIFT + and ESC in case CTRL Z is not working.