That fairy garden looks great,Catch-up! Just to my mind maybe still a bit bare? How about planting some slightly larger plants around it,which will shelter it and make it look a bit more mysterious and secluded,so that fairies can hide between the leaves.Fairies prefer to have running water close,so if you want to splash out a bit,install a tiny fountain or brook,you can use a small water tank pump for this,you´d just need a water proof power connection.Also don´t forget that fairies like living close to their friends,like butterflies and bumblebees,caterpillars and beetles.
So how about Buddeleja,summer lavendar etc.,who all attract butterflies and bees and will make for fairies,too : "Girls,was that flutter just now a fairy?I´m sure it was!!"Fairies also like "old-fashioned" plants and herbs that used to grow wild in gardens or forests or along the roadside.Google to find plants that would be good for your garden together with your girls,which will also mean they will learn a lot about old gardens,flowers and herbs,plus you can be environment friendly and find plants that are nearly extinct and give them a place to grow and thrive.Some of those "old" plants are especially important for certain kinds of insects.You could add an insect home,which is easy to make and cool,as you can watch all sorts of insects "move in".It could hang on the fence behind the garden and will stay interesting for a long time.
Also,how about watching that film about the two little girls who found fairies and took pictures of them.They also made houses for the fairies,so you can get new ideas.
Hope you like my ideas!Have fun!
It´s still magic even if you know how it´s done.