Can you get procreate on there? I know it costs money, but it's so worth it.
On there, there's plenty of brushes and you can download more easily online.
Of course, its just a suggestion
Omg it's so good! For the grass you could look at other illustrations for ideas. The great thing about digital art is that you can play around with it as much you need.
One of my dreams has always been to be able to draw cats. Guess I was cursed. No matter how much I practise or how many studies, I just cant lol.
Yours are so good! And so are your characters! Wow!