dribble

yes. actually the marque selection you have made will make no difference. once you apply an effect to a layer it will work with what ever pixels are on that layer. since there are none you will see no effect. just try using the brush or flood fill and you'll see all those effects working on the pixels.

EDIT: note that the colour overlay will take precedence to the gradient overlay. so if you need to see the gradient you'll have to drop the colour overlay opacity %.