Seeing yours is actually what made me want to make one of my own. From what I can gather from yours, you just need to put layering to use a little better. Also, take advantage of the Selection tools available in Photoshop, assuming that's what you're using. Also, the Pen and Direct Select tools can work wonders when trying to get your outlining and fills perfect. Don't worry. The more you learn about imaging software, the more you find yourself capable of.