i like the idea, but the reflection in your UFO is kinda off and i think it detracts from the believablity... because of the composition of your shot, we shouldn't be able to see the reflection of the car on the right because it's behind the ufo. as far as a reflection of the environment goes, we should be seeing the area that the "perspective camera" (for lack of a better term) is in, and what's behind it instead of objects that are behind the ufo.

also, as bright as your image is, your UFO is pretty dark. if it's that reflective then it should also be pretty shiny and bright just like its environment, right? i think you just need to increase the intensity of your lighting.