The way you could improve is to use more color, add more light sources and use less black.
One thing you also have to do is to think more about what would look appealing to the viewer.
For an example the airplane takes away all the attention from the main object which is in this picture the bridge between the two Islands, therefore you have to direct all attention towards that area, to make that happen you have to remove the stars, some of the birds and the airplane.
So basically in short terms
-Color/shade better next time
-Cut down on the black shading, the less darkness you have the more impact the shadows will have.
-Focus on whats important, and remove unnecessary details.
-Make up a focal point and focus on that, the focal point shall normally be more detailed than the rest of the painting.
-Make something interesting, and crop it right.
-Include more contrasts, a wider color range.
And don't be afraid to experiment with new ways to paint.
Last edited by Ezeth; Aug 17, 2011 at 08:27 PM.