Here’s something I whipped up, just some vague hill shapes painted over the background, and some bloom thrown in.
My recommendation (other than adding a background) is to focus on refining the interfaces between the objects in your scene.
Where the gussets meet the stone, where the walls and posts meet the ground. Right now they just slap into eachother, which looks fake. Adding footings for the posts and walls, and protruding stones for the gussets to rest on will help tie the whole thing together. Plants also tend to grow up at these interfaces, since water gets trapped there, so you could add some plants there if you like.
The other improvements are going to require addressing narrative concerns. Who lives here? What do they eat? There is some fire wood, but not very much, but the leaves are changing color which means that a cold winter is coming, so this person is probably going to freeze to death? Stuff like that.
For a first project though? Excellent work! Good on you for jumping in and making something complicated!