honestly great first go at a painting, better than I did! I’ll give you a handful of tips if that’s cool
What I noticed first was that you killed your shadow on the foreground bushes, without a difference in value you lose the illusion of foliage. Start dark, not a lot of paint to start or it won’t stick, then tap on some highlights.
The two trees left of the main tree should be darker, switch the values of the furthest tree and those two, and the perspective will be improved a little bit. I’d also cover up the two tree trunks a bit more, like how you did with the main tree. It’s not a hard and fast rule but I like to do darker colors in the foreground, lighter in the back as it gets further away.
Personally I would have blended the reflection of the trees a little more, the two reflections closest to the right sell the reflection more than the one to the left, because that one is darker and more clearly defined.
A point about clouds, your top cloud is hanging there in the middle of the sky, it could be more dynamic if you let it start outside of the frame, and kind of branch out from there, it looks more natural and adds movement. I like the brushstrokes.
You could add some “stoppers” in the painting, that’s something bob ross would talk about sometimes. You could add a darker color to the corners of the sky, and some very dark foliage in the very foreground of the painting, kind of coming up from the left hand corner. It blocks things in and keeps your eyes from sliding off the painting.
Last point, I know there are technically seven defined trees in the composition, it looks like six, and when you paint natural objects like rocks, trees bushes in even numbers, it doesn’t look as natural. I usually paint an odd amount of natural objects, man-made objects are more even. Doesn’t matter too much but I think it makes a difference
If you disagree with any of this, that’s completely valid, it’s your world and you choose what you want.
I think you’ll improve pretty quickly