Utpal is right about the goemetry, and also it needs some dirtying up. If you have the winds and body all mapped out, it should be easy enough to add some parts where the paint has warn away, and faded. Things like that will make it a realistic render.
Also looks like your rendering in software render. Try mental ray, it soo much better, specialy if your after realism.
In saying all this, if its the cartoon style your going for, it pretty good