I love how you're able to create such breathtaking scenery using only a few colors and simple shapes. I specially love how you made the river. However, the edges look kind of blurry. I think you should use a harder brush here and there. Also play around using different line thicknesses to add more life to the image. I'm no artist myself so I can't help much, but I think you have potential so I recommended you for scout. Good luck!