What should we plant in this bed to help screen the shed behind?

We are in WA and the area receives western afternoon sun in summer which cooks us and the lawn. After a consultation with a landscaper we took on some advice and are in the process of creating this bed. Not seen in the picture is a native garden across the path from the lawn.

We’d like to tie it together with the native garden OR because of the European planting choices take advantage of the retic water we’ll be using in the bed and perhaps get another showy exotic if we love it. As seen in the second picture we’d like something more bushy to screen the shed behind.

These are some options we’re considering: Silver dollar Silver princess Wattle Maracopia Protea or waratah Eucalyptus Victrix Dwarf flowering gum

Non-native: Hong Kong orchid tree

Thank you!