The cathedral is Gaudi’s still unfinished Sagrada Familia in Barcelona, Spain
I think it’s an interesting piece and it’s an amazing building, but i’m always wary of showing famous buildings in mattes unless
- you’re going for complete realism (like a period drama), in the form of an ‘invisible’ matte, or
- director has stated he wants the building there as an identifier for the city.
The problem in my opinion is that i’ve seen many mattes which are fantasy but have used, say, st Peter’s or the sears tower as part of the picture, and it just drags you out of the ‘world’ that they are trying to create. The exception to this is when they show the building as part of an alternate past or future where it has been taken into a different context. I just find it odd when someone decides for example to transport say Notre Dame into a jungle matte just because it looks ‘cool’.
anyways, Rant over 
I think with this matte you are in that teritory of the alternate future so it’s pretty good. My only note would be that the scale of the Sagrada Familia, in comparison to the surrounding buildings…is really extreme! (i don’t know if this is what you want or not). I mean, at the distance it is in the environment it’s looking like the Burj Dubai scale or something…or even bigger!
Overall though, quite an arresting and powerful image, keep it up!