Okay, this is probably the best I can so with a laptop. The background is awesome by the way. And my shading is a fail. Compared to what I can do on paper anyways.
Can I make a suggestion? Try using layers.
Double-click the thing that says "Layer 1" And rename it "Background"
Then click the little plus button and name it "color"
Click the plus thing again, name it "Shading"
Click it again, name it "Lines"
Or whatever you want to do with it. It makes things a lot easier, and cleaner. I saw you only had one layer. If you don't like using layers then that's fine I'm just telling you what I do a lot.
Can I make a suggestion? Try using layers.
Double-click the thing that says "Layer 1" And rename it "Background"
Then click the little plus button and name it "color"
Click the plus thing again, name it "Shading"
Click it again, name it "Lines"
Or whatever you want to do with it. It makes things a lot easier, and cleaner. I saw you only had one layer. If you don't like using layers then that's fine I'm just telling you what I do a lot.