Scoop avocado flesh into a bowl. Add lime juice, salt and garlic powder, then mash with a fork until mostly smooth with a few small chunks remaining. Taste and add more salt if needed.
Transfer the guacamole to a square white ramekin or small bowl (about 10 x 10 cm), smoothing the top flat.
Press two grape tomatoes into the upper third of the guacamole as the eyes.
Press the red pepper strip below the tomatoes in a slight curve to form the mouth.
Lay the jagged kiwi strip across the very top of the guacamole to suggest bolted, messy hair.
Set the ramekin on a large dark board and surround it with clusters of tortilla chips, cucumber coins and pepper strips.
Serve within 30 minutes, or cover guacamole surface directly with cling film and refrigerate for up to 2 hours.