Good. Could be better 

Here are a few suggestions:
- Keep the outlines a similar color as their object. For example, the distant hills are much brighter, so you should use brighter outlines. (You can also not use them)
- Your outlines have a lot of jaggies. See the FAQ if you don't know what that means.
- When you're drawing a landscape, things that are far away will typically have less saturation (less color) and have more blue. The most distant hill in your picture is more yellow and has a stronger colour, so it looks like everything else is covered by a cloud or something.
- It's very hard to see the objects on the closest hill. The flower stalks are almost the same color as the grass and I don't know what that other thing is.
- Unless your birds are specially trained, they probably won't all have the wings in same position at the same time :)