An expensive-looking garden is usually simple, edited and well repeated.
You do not need a full redesign. Start with fewer materials, bigger pots and better lighting.
Use fewer colours
Keep pots, furniture and cushions in a tight palette. Repetition makes a small garden feel more designed.
Go bigger with pots
A few large planters look stronger than lots of tiny ones. They also give plants more room to thrive.
Add warm lighting
Lanterns, festoon lights and soft wall lights make the garden feel finished in the evening.