If it a static photo, that would be more difficult as you would want to match the existing perspective lines. What would probably help this is to know the camera lens' specs (focal info) so you can try and convert that for use in Bryce (Bryce FOV)

Here is a link to a (f)mm to Bryce conversion table;
http://www.castironflamingo.com/tutorial/camerareference/index.html

As far as Matte Painting, it is easier to have seperate (photo) elements instead of a locked down 'plate' as you can manipulate these elements around your 3D renders as in the steretypical scene of say, a sci-fi building in the midst of a mountainous jungle, etc.

The more obviosu difficult scene would be 3D buildings inset into an photo of pre-existing buildings as the eye would have numerous comparison points.

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