A third way to generate the list of problems is to first picture what a properly safe wash basin would look like during an outbreak, and then treat every difference between that ideal and the basin shown in the picture as one of the ten problems.
Imagine an ideal, safer version of this basin: touch-free or foot-pedal taps, individual soap dispensers at each station, stations spaced well apart, a smooth non-porous surface that is easy to disinfect, a proper drain with no standing water, and a hand-drying option such as paper towels or an air dryer.
Compare this ideal basin, feature by feature, against the basin shown in the image, and write down each specific gap as one problem: manual taps needing hand contact instead of touch-free ones, no individual soap dispenser, stations placed too close together, a rough porous surface instead of a smooth one, standing water in a bucket instead of proper drainage, and no towel or dryer, continuing until ten gaps are listed.
Choose the three gaps that pose the highest infection risk to illustrate, for instance the shared tap handles, the lack of soap, and the crowded spacing.
Illustrate each of these three as a simple side-by-side comparison sketch: the basin as shown on one side, and a small labelled version of the safer feature on the other side, with an arrow or label naming the specific gap between them.
Comparing against a safer reference basin, rather than brainstorming problems freely, makes sure every listed problem is tied to a concrete, fixable gap rather than a vague observation.