i suggest to town down the amount of black lines around/in the tree, and aim for a brown, dark brown isntead of using a pure black. the sky seems weirdly shaded, and it doesnt even need to be shaded, it only uses shades of night and of the sun, you dont shade it like if you would be shading a sphere or the dh, try to make it a gradiant next time, use more than one layer. you either need to make the head smaller, or the body bigger, there are some proportions flaws that removes any logic