Nice. I don't myself use stickers so I can't comment on that. Not sure what they're used for in a piece like this -- like decals on a model plane? With all the interest in the details you show, while I'm sure this is a natural point of view in the air with scale and so forth, for a painting it's kind of thin. I would think you would like to try staging it in various ways, like with one or both of the planes closer and thus bigger, filling the painting with more interest. Then you could really go to town with the details. Good experiment.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream