Integrated seating saves space & does away with the necessity for furniture which could clutter the space. This tiny garden even has a water feature. And restricted planting space doesn't mean there can't be plenty of plants!
built in garden seating - Google Search
a horizontal mirror can double the space of a patio -image via housetohome.co.uk
Not white as it would be too bright but like the large pots and plants & water feature.
Love the screening, with stairs leading - would work to screen neighbours until trees grow, create informal living area - love the concrete and "contained" plantings