I agree with Lady_J its a very busy pic. Have u just done some post in photoshop or is that actually a texture? I dunno if maybe ur bump is set at too low a value or what. What size is ur texture map? Personally I create all mine at least 512 x 512 pixels - gives a bit of space to work with.

Im really impressed with what u have done actually. One little improvement maybe to add more lights to the bottom of the UFO. For example take a look at Close Encounters of the Third Kind and see how that works out. No doubt ur using Independance Day as reference so I guess u'll know what i mean. Cool work vectorman

oh and as far as the video footage goes, I think ur pretty much stuck with it im afraid...its all down to the quality of camera/film u shot it with. Im sure u can prob do something in Premiere or Shake to clean it up and remove scratches etc but its not gonna be a great improvement.