mock up shadows and reflections

Hi Community,

I Make mosaics for entryways such as the large carpet area in photo.

I know how to do basic mock ups but for this job i want to go that extra mile and learn how to put the mosaic behind the door on the right. is there a way where i can add that detail? 

So just to reiterate, Am i able to insert mosaic mock-up so the door to the right still has the reflection of the street? If so, how? or what shall i search for on youtube?

Thank you 

Daniel