Yes, you're already showing some good progress. I have a suggestion for the sky: get rid of the squiggly lines there as well. Our sky is pretty uniform and doesn't have any noise in it. However, a gradient would be nice - the sky is usually a brighter blue towards the horizon and gets slighty darker and more saturated further up (you don't need a lot of colours for the gradient though). You should also make the hills in the background shift more towards blue so that there's a better sense of depth and perspective in the picture. That being said, the perspective of the river and the tree does look way off - the water looks like it is viewed from the top, while the tree seems to be more of a side-view. Also don't forget to make some kind of transition from the grassy hills to the river, there could be a river bed with sand or rocks, or plants hanging over the edge.