Haha I remember my first digital painting I did... Did not go over super well to say the least!

As for this painting one thing you need to work on is the grass, I think you can already see that and it will come a lot easier with practice! Also another thing I think is you could have added more textures into the mountains, I see you added a couple blending colors the out the rest as dark grey, I don't think I like it too much like that I think it would look better if you blended a little more or even just slowly darkened it as it went down not just one flat color.

Other than those couple things it looks a lot better than my first so big ups to you!

Not a bad start. try adding more colours and detail in your work to achieve more depth and contrast. you can easily add double or even triple the work onto that, also keep in mind you have to add a main subject.

Explore other styles of brushes to add textures and blending styles, this is a good place to start if you plan on doing realism style paintings. Also explore the pressure feature to get ace curvature, takes a bit to get used to but practice my friend.