nice work with the colors! the purple background is nice to look at. However, there are a few things I feel like you could improve on..
1. crop the picture here- it should end before the sky takes up too much of the image- make sure the focus of the house is what the focus actually is.
2. Mountains should be sharper- Most real mountains have jagged edges and not curved ones, so you can use a sharp pen tool to better get that feeling of sharp rocks.
3. Real trees less "shaped"- by this, I mean that real trees aren't really seperated into two distinct portions like the ones in your drawing are. make them also a little more jagged, like with the mountains.
4. Add more stuff- This doesn't mean to overload it- but some parts of the painting are somewhat empty, like the side of the house. Also add some more plants to the grass around.
5. More clearly defined edges- This is one of the main things I think art works about- lines. Use a dark color to clearly separate boundaries and make the image pop out. I've done the building and some of the trees how I'd suggest you start
6. use references- for the trees in particular, look at real trees of that same type and try, try to imitate how the picture looks.
finally, 7: Think about perspective in regards to things being too large, like that plant. how close it is to the house makes it look like it's really huge. I've made a smaller plant next to it to suggest how you should size one.
