Shapes: I like that you're using brushstrokes to indicate the direction of the forms, it helps a lot. Just make sure that the shapes you're creating works and points the viewer around. Use triangles as shapes, even when you're painting something that isn't a triangle, such as a box etc, you can always put more emphasis on one edge creating an "arrow". It will work as a tool to "guide" the viewer around. Just experiment.
In general your painting is very flat, there is a background, although we can't tell on what "depth level" it is at, then there is the wings and then the body. The wings are the elements makes it the most flat at the moment, try to create some sort of motion..Are they moving? then indicate that etc.