The fundamentals is what you should start with (you can find plenty tutorials and materials about them online on YT for example), that means pespective, values, drawing etc. the first thing that strikes me from this image is lack of values.
That means that the shadows are not dark and light areas are not bright, basically think of where would light be coming from and where would the shadows be casted. I'm a noob myself but this seems like a good place to start. In photoshop you can make a new layer, set it to "color" mode and fill it out with black that will give you a black and white version of your image and allow you to see the values, like shown below. Hope this helps a little.
Try to look at composition, the tree should be the main object but it's almost out of the image. Look up the Golden Ratio rule 
You have a lot of grass which is not that interesting to look at. Also, there is no perspective. You'd expect grass closer up is larger then further off. Lastly, There are no shadows/values, try to look into that!
Have fun on your journey
In general its hard to give critique on pieces like this because, at this stage is quite self-explanatory. Its all about fundamentals.
Not sure if you follow cubebrush (owner of this site) youtube channel, but do check this video
If you are going into landscapes then I suggest checking out this video
It helps tremendously for
1. Setting up your scene
2. Concepting out ideas
3. Focusing on the overall feel of the piece
4. Composition / Placement of the scene
After you feel quite confident with getting your value/image to read well, start experiment with colors. For now, take things in small bite-size, such as maybe focusing on how to paint a tree for example, or how to paint a rock, or how to make a rock read with just 2 values.
And don't be afraid of using reference or even getting out there to draw whats in nature. The best thing to do is to start drawing the subjects you want to draw. Eventually you will be able to do them from your imagination.
Overall this is how I would go about doing it. Again this is my own take. It has its own set of problems since I am still learning, but I like to keep things simple.
And one more video suggestion on How to Study
If you are just starting out though, just setup that drawing habit. Don't worry about too much technical issues yet. Because its easy to stop drawing if you're having a hard time, so best to start drawing your interests, and eventually introduce technical learning (techniques, how to color, perspective etc.) in your workflow/learning path.
Cheers!
Maybe find someone that you really really enjoy and or someone similar and find their process pieces. Post them here and I can help you see what they do first.
Imitation is usually the first stage most of the time but that's fine because it's what inspires you. What type of art is it? Figure, landscape, animals, concept art, illustration, abstract? What type of style? Oil painting, acrylic, dry media, or a digital imitation of the three?
Dynamic shapes and layers in photoshop? We'll get there.
Copy copy copy is the first stage.
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