There are 2 things that I thought could make a big difference in making your app.
that the icons you choose from are at the bottom or in the menu on the left_ That you could upload your own icons and use them, that could be pretty cool features.
that you could with a simple add function. could add an image on his screen and link the individual image to a place in the app.
the 2 things I thought could make it more attractive for the design itself and make you have a little more freedom in your design your app
but is also only an idea and suggestion for it