I like this result. Notably the light shade in the upper left that, intentional or not, conveys a feeling of gazing against the sun. Cool.
As for feedback, you could integrate the grass more into the ground by smudging the lower edge of the grass. Use the smudge tool (or MyPaint brush) with low opacity. You can quite easily add "layers" of grass in front of each other to increase the impression of complexity. This covered in more detail in
this tutorial.
I like how you went with the basic gist of my tutorial and added your own touch to it. For a first painting, this is very well done indeed. Good job!
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Griatch