1) Make a set-to-zero action on the main menu bar.

2) Make a "Preset Value" pulldown menu.  Inside it are actions "Set to five"
and "Set to 10".

3) Make a label with the value of the number.

4) Make a label with a picture of ....

Useful tutorial
http://zetcode.com/gui/pyqt5/menustoolbars/

Code to start from:
http://euclid.nmu.edu/~rappleto/Classes/CS495.Python/qt_example.py

QLabel example
https://www.tutorialspoint.com/pyqt/pyqt_qlabel_widget.htm