Hm, the colors are unappealing to me. I would recommend more vibrant colors like maybe mauve and a burnt orange or lighter blues. As well as the clouds, I don't like the grey, ans especially not the black plane that really sticks out. I think it would stick out enough if it were the same color as the clouds. So my recommendations are revamp the colors, and make the clouds/plane maybe a very very light purple or off white.