As far as building for shows, I don't do that. Well... I suppose I do in away, but not with the express intent on winning awards.
I will build a certain kit to fit into a theme, but I still build it for me, and only me. As long as I am happy with it, any awards it might receive is just a bonus, and isn't what I strive for.
That being said....I try to improve myself on each kit, usually trying out something new, but again, if it gets me awards...fine, but I won't be upset and sad if I don't (unlike some people).