Are there more instructions for LEGO Architecture Studio?
I don't think so.  I've found a few places that show nothing but the original book for it in terms of official LEGO content:


http://lego.brickinstructions.com/lego_instructions/set/21050/Architectuer_Studio
https://www.repubrick.com/index.php?option=com_virtuemart&amp;view=productdetails&amp;virtuemart_product_id=451&amp;virtuemart_category_id=38&amp;lang=en
https://www.reddit.com/r/architecture/comments/1k108y/the_lego_architecture_studio_manual_via_legos/


Tom Alphin's book

While it isn't entirely instructions it does include lots of instructions: Tom Alphin's book The Lego Architect.  It has been a while since I flipped through it so I just gave it another skim.  I'd say that a third to a half of the pages are dedicated to detailed instructions.  The rest of it is lovely inspiration so it isn't like filler.



Brick Architect blog

Tom Alphin also has created a blog that has lots of LEGO architecture designs in it: http://brickarchitect.com/ but I didn't see any instructions there.  It is still probably worth checking out for inspiration.