A convincing film/animation still

I'm a visual and mixed media artist, my medium is drawing and expanded drawing and I've been asked to contribute to an exhibition that has a 'film still' from something that is not yet realised, eg fictional and I have crudely mocked up my response but I want it to be more convincing as something that could be from an actual animation or cartoon.

It combines drawn and collaged photographic elements so that it hovers between real and imagined, I think it needs movement and perspective to make it work however I'm totally open to suggestion and appreciate creative input.