Say three large pots with palms or other lush foliage plants on the pool deck. Four kind small nice beach style chairs. Screen the tanks with fencing or the yellow butterfly palm like the potted one in the one picture.

Train some vines up the fence. Not Bougainvillea. Hate it.

Orange Flame Vine - Pyrostegia venusta

Sandpaper Vine - Petrea volubilis

Coral Vine - Antigonon leptopus

I wish I could DIY like that! I would soften up the hard lines with lots of plants, add some furniture to the pool deck, and create a fire pit. Plant some vines on a long trellis between the back of the pool and the fence since you don't have much room for other plants.

On the yard side of the pool, plant some low lying evergreen perennials along the deck edge, leaving a space in the middle for an opening . I'd suggest but I don't know what lives well there.

In the space you left as an opening, make a small 4ft x8 ft -ish curved path of pebbles or concrete stepping stones (like the ones you already have) that leads to a fire pit in the yard, circling it with 4 or 6 adirondack chairs in white or same color wood as deck. A small bistro table and chairs with an umbrella on the front right of the deck would look nice. Add two other chairs at other corners or pool, include a potted palm like you have in one of the corners Cover up that stuff in the corner with some elephant ear plants that grow huge and are cheap.

@A J , Thank you and thanks to YouTube. The corner meaning the water tanks? I actually can get giant elephant ears here. @Christopher C, Thank you, I’m going to check for those vines locally. Bougainvillea would be too heavy for the fence anyway. The metal sheets are screwed to a lightweight chainlink fence in only 2 places.

Some large plants in colourful pots on the deck, or plant some trees. Colourful umbrella or shade sail. Chaise lounge. Hammock?