first of all, many positive associations with captain skyhawk! this is a good thing. second, you have way too much dithering, not nearly enough contrast, and your color choices could use a lot of work! don't be afraid to think really critically about your textures as you work the piece. e.g., some of your blades of grass are 3 pixels tall, even down there in the background, which is about as tall as your arwing's cockpit is long. Trees aren't spheres! If the tower is tilted (according to the texture and sides) how come the top is still flat? Think critically! Squint at your work, and be a jerk to yourself, it will pay off in the end!