I would LOVE to see more interaction of buyers at the nursery with items you buy for it - like children coming in to watch the birds and fountain when you get those and such.
People sitting around on benches - maybe a coffee stand you could buy and such.

Maybe some kind of bird watcher spotting game added.
There might be more bird boxes to buy in the supplies section - to promote more different birds flying in .

In the main section - Maybe more different types of bugs - including other things like snails,worms, green garden snake and such.

Maybe some pots in windows and other areas added around the greenhouse or different backgrounds and areas of greenhouses to choose from or buy at the supplies place.

In the supplies section - Have an assortment of different kinds of pots you can buy.
And different kinds of windchimes.
I LOVE the windchimes sound effects when they play sometimes in the 1st game.